astcell: The D4 is perfect for me. I am selling my D3s. I use 8+fps shooting speeds regularly. I shoot at 50,000 ISO regularly. Black cat in a coal mine stuff. The D800 frame rate is waaaay to slow, and the ISO peaks too early.
I shoot very little video but the D4 wins out for other reason I have yet to see confidently addressed, such as:-Easier layout of controls for video use-Backlit buttons-Faster motor (even 1fps more helps out)-Cleaner lines
Yup, I splurged and got it. I'm sure my subjects will not know the difference, but when I get that one shot it will all be worth the while.
I shoot 6fps regularly, that is my "normal" speed. I can manage single frames with 6fps too. When I want faster with the D3s I went to 8, I am now adept at 10 with the D4. And yes I have used it. What on?Controlled crashesDogfightStuntsAir acrobaticsFalling object acceleration graphics... and a few others.
Some places do not allow flash. Even the conference pics would lose their glow if I used a flash, so up goes the ISO. I shoot at 3200 regularly but have gone higher for all the shots in darker places.
My conference and event pics are online to share with the attendees and public. You need a password to logon to the site to see the rest of my work, but that is up to the clients.
Can I live with 9fps or 8fps? Yes. I can "live" with a Yashica T4 if I have to make do with what I have. But it's nice to have options.
I upgraded for more than 1fps and after re-reading my review I see that it was rather short, I could have done a lot better, but we are limited in characters here.
The D4 is perfect for me. I am selling my D3s. I use 8+fps shooting speeds regularly. I shoot at 50,000 ISO regularly. Black cat in a coal mine stuff. The D800 frame rate is waaaay to slow, and the ISO peaks too early.