With the release of the 500D, I've been reading a lot of heated debate in other forums claiming that Canon is losing ground, and that Nikon is the place to be -- better AF and micro AF adjustment support. I understand the latter, but does the former have any sound statistics to support it, or is this just chest-thumping or internet rumor mongering? I ask only because I've got an XTi and some cheap-o lenses (35/2, Sigma 18-55 and Canon 55-250). I'm thinking of stepping up my investment in DSLR stuff, and possibly move to the 500D body, but not if there is a better system. I realize there are ergo issues, and other bells and whistles differences, but I'm just asking here about Focus. Has anyone seen any concrete statistical proof around Canon AF issues as being worse than Nikon? I have no issues w/my XTi, but I'm a little fearful right now to invest more.