Canon has some sample files and movie clips from the 1D Mark IV here
Canon: EOS-1D Mark IV Sample Images & Movie
Below are a few short snippets from the Rob Galbraith preview of the newly-announced ESO 1D Mark IV, with a few comments from me following each quoted segment.
Rob Galbraith DPI: Canon announces 16.06 million image pixel EOS-1D Mark IV
"...the circuitry that reads each pixel's signal before pumping it through eight channels to the analog-to-digital converter."
***This is a nice feature--read out noise can be minimized by using multiple,separate channels. Nikon's D3 uses six read out channels due to its larger pixel pitch of 8.45µm; with the 1D Mark IV having a smaller, 1.3x sensor and 5.7µm [ µm micron square] pixel pitch, the added two read out channels makes perfect sense as a logical way to reduce noise in the signal coming off the chip, before the information reaches the analog-to-digital converter. A welcome (and probably necessary!) hardware design feature considering the jump from the MK 3's 10 MP to 16 MP, with smaller pixel size.
"...Mark IV offers one full resolution plus two reduced resolution RAW settings, MRAW and SRAW."
***Nice! Medium and Small RAW files will give better post-production white balance correction and wider dynamic range than in-camera JPEGs, and will use less CF and drive space,and will shorten download and FTP file transfer times for those working on tight deadlines. I have been VERY impressed with reduced-size RAWs from the 5D Mark II. For newsprint, which I have shot for, 6 MP is ample,really.
"Like the EOS-1D Mark III, the EOS-1D Mark IV's sensor is the self-cleaning variety. The newer camera, however, incorporates an anti-dust fluorine coating on the outer surface of the sensor package." ***Self-explanatory--good, and good.
"... numerous aspects of the 45-point AF system in the EOS-1D Mark III have been reworked for the EOS-1D Mark IV. Canon has made changes to both the hardware components responsible for AF as well as the algorithms that govern the AF system's behaviour. There are feature changes too, such as the ability to manually select from all 45 points individually (the EOS-1D Mark III limits manual selection to a maximum of 19 points)." and also "...can optionally be configured so that the active AF point automatically switches when the camera pivots from horizontal to vertical, or vice versa"
***The ability to have the AF point rotate when the camera is turned was one thing MusicAle expressed a desire to have in the 7D; well, for just under three times the cost of the 7D, users will get that feature in the Mark IV.
***The Mark III had the fastest one-shot, initial focus acquisition Rob Galbraith and his staff had ever tested, but there was an ongoing 18-month saga of AF problems in sequential shooting with many bodies. The Mark IV will be equipped with a new, different AF system, with a chance for new features and new hardware and software to bring the AF up to a truly state of the art performance in the field. Where the 1D Mark III was not even UltraDMA2-compliant,thus limiting the camera to an 11MB/ second write speed, the Mark IV is UDMA6-compliant, making it compatible with new cards that write in the 600x or 90 MB/second speed range. Not sure about the write speed of the second SD/SDHC card slot, but the presence of an SD card slot will allow the camera to use a Wi-FI enabled SD card, thus allowing direct camera-to-network or camera-to-web uploading feature,allowing location shooters and photojournalists to upload without the need of a laptop computer or Canon's add-on wireless unit. SD cards are also inexpensive,small, and available at Mom and Pop stores around the world. I stopped into a remote mountain store called "The Outpost"...they had fishing tackle, beer, firewood, snow chains, and SD memory cards right by the fishing tackle and battery section...50 miles from the nearest real town, and 15 miles from the end of the paved road. The area I find oddest in the stated RAW buffer depth of only 28 images. That is roughly 2.8 seconds at full firing rate,and I wonder if like the Mark III, if the buffer will lose 1/2 to 1/3 capacity at elevated ISO settings such as 3200, or if the buffer will *truly* be 28 RAW files. Nikon's D3s has a factory buffer size of 45 RAW files, or five full seconds' worth of shooting at maximum frame rate of 9 fps. Considering that a long North American football rushing play can stretch out over 10 to 15 seconds, and the useful shooting zone on most track and field events lasts roughly 10-15 seconds from the last turn to the finish line, the more seconds' worth of full-quality firing, the better for a sports/action camera.
The Mark IV also has a new ISO range, with ISO 100 being the base ISO, with native ISO's up to 12,800. Settings above 12,800 are not native, and are roughly ISO-equivalents (not fully compliant with ISO standards), and there are three Hi-modes, 1,2,and 3, that take the camera up to an Exposure Index of 102,400. I have read Canon's information all afternoon: the Mark IV does not have color-aware light metering or color aware focusing information, or the combined aware metering and color-aware AF system that Nikon has in its newer bodies. And the cross-sensors in the Mk IV? SOME f/4 lenses and SOME f/4 effective f/4 prime telephoto lens + Teleconverter combos will be able to use the 39 cross-type sensors; the 17-40 f/4 L and 24-105 f/4 L lenses, although not actually f/2.8, **will be able to** use/access the 39 cross-type AF points, as will the 70-200 2.8 L-IS + TC 1.4x, and the Big-Glass 200mm f/2 + TC2x,the 300mm/2.8 and the 400mm f/2.8 with the 1.4x converters. This is a BIG step up over the Mark III. Some props to Canon for clever engineering there.
What's a bit odd is that the 70-200 2.8 L NON-IS model + 1.4x converter combination will *not* have access to the 39 cross-type sensors,according to Rob Galbraith's site. Neither will their 500mm f/4 L lens.
Still, Canon's got a bunch of new multi-spot, patterned AF focusing schemes, which is something Nikon has had since 2004 in the D2 series, and is in my opinion, a big step up for action shooters. The lack of the new-style viewfinder screen found in the 7D is a necessity for those who want to be able to manually-focus fast lenses by hand and eye, especially off-center, and who wish to use auxilliary viewfinder screens that give better manual focusing ascertainment with fast glass; the 7D's new ultra-bright transmissive viewfinder screen is causing a lot of focusing problems for sports shooters and fast-glass users who report being unable to accurately ascertain focus visually on the new, super-brightened, ultra-clear viewfinder screen; the older-technology viewfinder screens found in pro Nikons and pro Canon bodies is a little dimmer than the 7D's screen, but the older-technology has proven itself for multiple generations,and buyers of $5,000 cameras want to stick with proven technology most of the time.