What's the diffrence between a GSX-R600 and a GSX650F?

GSX600F is a bit heavier than the gsxr. I have heard that the katana(gsx600f) is much more comfortable than the gsxr. I have a katana and I think it's perfect for me. Yes it is the 600, but it has a jet kit to help with matching the power up with the gxsr. Does have the same power os a gsxr but that's only because of the jet kit, and other high performance upgrades. It is very fun, I would just stick with a katana, but everyone has their own opinion. Parts for katana are also cheaper.