Is your keeper rate particularly low? Due to AF trouble?
I've not run into that in the situations you describe in your first post.
But the issue mentioned later with the 1.2L,. I've never shot with that combination, so maybe for this application you will see an improvement.
The AF difference is huge, I just didn't think it was a big issue for studio work.
As Jake said, the AF difference is huge. I don't think it'd justify the price difference for studio and location portraits though. On the other hand, if you shoot action or quick paced events, the 5D3 is well worth the price jump over the 5D2.
Thank you Jake ans Staszek. I think I'm convinced to just keep the 5D2 for the moment or maybe just go for a 6D which I read has improved AF over the 5D2.
Everybody is different. $1500 extra vs $130 for rental sounds reasonable. There isn't a black and white area. It's more of a gray area for liking and disliking about this camera. For studio the 9 point system is more then enough, it's the fast candid and action shots that requires a more accurate AF system.
I know but If I were to do this, I'd rather just buy the camera and return it if I think the camera doesn't fit my needs. I'll pay $25.00 tops for return shipping.