In regard to the Canon 5d Mark III, Philip Bloom said it is less sharp, but sharpening in post seems to take care of that. While not ideal to have to sharpen that way, there is little to no moire and aliasing artifacts, and great low light. Now know that I am NOT a Canon fanboy...just wanted to share info that wasn't brought up here. I personally own HMC150, AF100 and GH2 and love them for their uses. I don't own any canon products.
What I'd like to see in the GH3 is more dynamic range, and higher bitrate codec. Also the GH2 added a 30p 24mbps mode called HBR wrapped in 60i. So there are 2 24mbps modes now.
I'd also add perhaps more of a pro version with a more rugged body and perhaps extended battery grip that could hold two batteries.
What I'd like to see in the GH3 is more dynamic range, and higher bitrate codec. Also the GH2 added a 30p 24mbps mode called HBR wrapped in 60i. So there are 2 24mbps modes now.
I'd also add perhaps more of a pro version with a more rugged body and perhaps extended battery grip that could hold two batteries.