Hmmmm, a BRAND-NEW Nikon, announced just yesterday, versus a four year-old Canon 5D-II...
Positive features of Canon 5D MARK -II
1) Better shutter speed (1/8000 vs 1/4000)
2) Larger view finder (0.17x)
Positive features of Nikon D600
1) More focus points
2) In built HDR function
3) Larger screen
4) Shoots faster
5) Built-in flash
6) More cross-type focus points
The Nikon is what the article you referenced is saying is, "their suggestion" between the two cameras. Brand new versus already obsoleted by a higher-spec'd,newer model? For basically the same price point. And the first of the Canon's TWO (just two???) advantages, the "Better shutter speed" of 1/8000 versus the Nikon's top speed of 1/4000...wow, that's amazingly unimportant. I seldom, as in hardly ever, need more than 1/2500 second. Very,very,very infrequently will 1/4000 ever come off as being "too slow" of a max speed!
And, the dumbest thing??? THe Nikon has color-aware light metering for flash and ambient light....the 5D-II is color blind and dumb. COlor un-aware ambient and flash metering. If you want a high-end run-n-gun d-slr, the 5D-II is NOT for you; it is designed for a shooter who KNOWS HOW TO WORK A SIMPLE camera....it is very,very old-school and low-tech. The 5D series has always been for "serious" shooters; the D600 is a prosumer/hobbyist/MWAC/GWAC/rich casual user's high-end camera.