It's negligible if anything. If I wanted a smaller image like the D7000 I would shoot with my D7100. I chose the D800 for the big image.
Defeats the purpose lets stay on track.
We don't buy a mustang and rip the v8 out and put a v6 in it and make it silent so it doesn't disturb granny. What sense does this really make?
None!
Sorry Corey, have I gone and let the facts get in the way of your self proclaimed "expert" opinion. I only stated the approach used by numerous respected commentators regarding ISO comparison between cameras.
I must admit I take the same approach as you and use my D70 for 6mp images, my D200 for 10mp, the D300 is great when 12mp is the order of the day and only when I absolutely need 36mp do I get the D800 out. Frankly I can't settle on one or two cameras either, but it looks impressive when I list them in responses.
And just before you get the spanners out, it's perfectly acceptable to go to the shops in the V8 mustang without swapping engines.