AF will definitely be better on the 7d than on the 5dmk2 - but IQ on the 5d will be better. They have a really nice clean image, whereas even though the 7d has a nice image also, its just not on par with the 5d. Another option to consider is the 6d - has amazing IQ, the center focus point is very accurate (and I think from memory is canons current best at focusing in low light - something like -2 or -3 EV) - so you'll lose a lot of focus points and frames per second.
A 6d is be a brilliant landscape camera, motorsports it would do well, but prob not as good as a 7d.
http://www.canonrumors.com/category/...on-7d-mark-ii/
If you're patient (very patient knowing canon) they may bring out a new 7dmk2 in the next year. It has been rumored for a long while though.