Summary: This camera is incredible. I pretty much relegated my D90 and D300 to the back of the closet from the moment I charged the battery for my D4. There is nothing important to criticize. It is Nikon's flagship for all the reasons the word "flagship" was invented. I actually have tried to find something to dislike. The only thing I can come up with is that the smaller-output readings on the control panel at the bottom are difficult for me to see, even with reading glasses.
Excerpt: As good as the D3s for low light photography but with a little extra resolution and improved AF in low light. I bought it for low light work, and apart from the D3s there isnt another DSLR that can match it. I just wish it was smaller, like the D700, I would sacrifice some FPS and movie mode for size, then it would be perfect.
Pros: Easy to use, Great low-light performance, Great video qualtity New LCD screen is gorgeous, 3.2" diagonal Auto-exposure system seems very accurate Very high FPS (a small improvement over D3S) Built-in ethernet port for tethered shooting
Summary: Purchased this camera to supplement my other Nikon bodies used for my work as a professional fashion photographer. This is my fifth D4 body. They are used constantly. The Nikon system have been giving me nothing but superb results. This recent purchase is no exception. It is pricey but this is where you get what you pay for is true.
Summary: I purchased the Nikon D4 at the start of March 2013 for my photographic work as a professional Wedding Photographer. I use it alongside a Nikon D3s and I have to say that I have been completely blown away by its performance. Dynamic range at high ISOs, speed of auto focus tracking and build quality are all top notch. At first it seems quite similar to the D3s, but on closer inspection there are many little things that add up to make this a worthy successor.
Summary: I'm a full-time photographer and own two D4 cameras and use the D3s as a backup. I've used the D4 for over a year now and have only positive things to say about the camera. Even after 80+ weddings, corporate events and countless portraits and product shoots, the camera is still solid with zero problems. What I care most about is getting the shot! Image quality is a close second. The D4 shines in both of these areas.