I shoot with both now so I have a bit of a perspective... albeit maybe not as much as some... If you are shooting sports, the 7D wins hands down... This is not to say you cant get a few keepers every so often with the 5d2... it's just not as responsive... I may be a tad more sensitive with my keeper rate in focus, but i would say, for me and my taste, about 75% of 7D's photos in burst shots are acceptable focus and maybe even fewer crisp (but this is based off of crisp focus where I can count eye lashes or bolts on jets, etc) With the 5D it's got to be closer to 50% acceptable in burst modes and fewer crisp... Image quality, 5d wins but not as much as you would think with almost a $1000 difference in msrp, (closer to $500 or so street difference), which is what I think neuro was eluding to with his first statement in his response... Bottom line, 5d for studio, portrait, still life, and other image quality critical work, and 7D for sports, action, everyday stuff.