Hi All, I'm trying to make a decision for purchasing a camera. There are obviously a lot of considerations to make for such a complex device and I know that ultimately there is no better camera than the one that I choose. But I'm hoping I can get some help better framing my decision and hopefully have some light shed on other factors I may not have considered. My purpose: My wife runs a fashion blog. It isn't large and she hasn't found a wide audience yet, but we regularly shoot and have been doing so for about a year. I guess I'd call myself an advanced amateur. I currently have a Nikon D60 which I bought a long time ago. I use a 50mm 1.8 and I get great photos with it, far better than my iPhone. However, I would like to have more resolving power and better auto focus and I want to make this upgrade so immense that I won't need to upgrade again for another 5 - 7 years. I've been split between the D850 and the 5D MKIV. I've had my eyes set on the 5D for the year that it has been out, but the D850 appears to be capable of producing higher image quality for stills, which is my main purpose. I'll mainly be shooting portrait/fashion photography and some light architecture. My current camera isn't the best for sports or landscape, but I may take interest in these with a more capable body. The same goes for videography, where I understand the Nikon has an edge in respect to the codec, but the Canon has superior auto focus. I've never shot video but may take interest with a capable camera. I want to pair either camera to the respective brand's 70 - 200 f/2.8 lens, as my research indicates this will be an excellent portrait lens. There are a few questions I have: 1. Is the video/live view auto focus in the D850 really that unusable? If I wanted to record YouTube type blogger videos (studio or "everyday life" documentary type), am I really going to be at a significant disadvantage? 2. Research I've seen indicates that the D850 has dynamic range and ISO performance similar or better than the D810, even with more megapixels. DXOMark indicates that the D810's performance is marginally better than the 5D Mark IV. Would this dynamic range and ISO performance translate to actual real world results? 3. Are my handheld shots with an image stabilized lens significantly more susceptible to motion shake with the D850 vs the 5D MKIV due to the difference in resolution? Are there any other items I should take into consideration when comparing these two cameras? Are there unanticipated advantages which one system would have over the other? Thanks any help or recommendations.