I just received my mark II today, and while i've barely had time to play with it, I have to say I'm very impressed with the ergonomic improvements over the Mark I. The taller body makes the grip much more comfortable for someone used to larger DSLRs. On my mark I, I had to add the bottom portion of the RRS L plate to make it a comfortable fit in my hand. Maybe not for those of you who want a very small stealth street shooter, but works for me. The grip is also thicker, and subtly better shaped. Big plus. The 1/2 lever and ael/afl button have been reversed, so that my thumb falls naturally on the button, for back button focussing, or whatever one might want to use that button for. On the mark I, I had to shift my grip to get my thumb over to that button. That's a big deal to me. Other changes, such as the re-location of the menu and play buttons, are so far neutral. I'll have to use the camera a lot more before I pass judgement. I also got the new 12-100, and the balance and weight of it seem right on to me. It seems to be a perfect travel, rugged use, one body/one lens/no tripod combo. I hope to be able to get the camera set up and do some shooting soon, but I'm in the middle of some other projects (selling off old gear to pay for the new) so it might be a couple days. But, so far, I'm extremely pleased. Hope this info is of some use to somebody.