I know this topic has been done a few times, but I'm hoping to have some input specific to my needs.
Right now I'm loving my 40D but am thinking about other options. I don't think I want to go FF as I shoot primarily wildlife with my 400 5.6 and don't want to lose too much reach. But I do want to get the highest IQ possible for large prints, with low noise. I'm also envying some of the customizable features I've heard about regarding the 1-series.
I know that switching from a 40D to a 1D2 would mean a loss of 2mp, but I think people worry way too much about mp; my understanding is that the IQ on a 1D2 will be better (even with fewer mp) than on a 40D---? I'm not too concerned about body size, about speed-bursts or buffer sizes, about sensor cleaning or weather-sealing. I'm pretty much only thinking about image quality. Also, how would you characterize the difference in the AF system---say for someone tracking a bird in flight? Is it dramatically better on the 1D2?
I do realize the 1D2 has a slightly smaller crop, so I'd be giving up .3x, but I can live with that. Is the menu system so drastically different from the 40D that it'll take me a very long time to sort it all out? Is it way less intuitive, or just... different?
Any input welcome! (And if you're looking to make this trade, let me know! I'm still just mulling, but for what it's worth my 40D is in awesome shape with 17K on the shutter. I'd add some cash, of course, or maybe the Tammy 18-270 VC.)