The days of "having" to upgrade crop bodies is pretty much over. There's no reason to swap or sell a 7D for any other crop body....
Yes there is: much better ISO performance. I use mine for 'action photography' ie motorsports and wildlife and I unfortunately find that I'm often using iso 1600+ to get both the DOF and shutter speeds I want. Interestingly this is the body I would soonest replace. The 5D2 is miles ahead in image quality.
« Last Edit: August 03, 2013, 01:15:38 PM by mrsfotografie »
5D3, 5D2, Sony α6000, G16 | EF: SY14/2.8, V20/3.5, 24/2.8, 35/2, Ʃ35/1.4, 50/1.8, Ʃ50/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L, T28-300 Di VC PZD | E: SY12/2, 35/1.8 OSS, 16-70 ZA OSS, 55-210 OSS, SY300/6.3 ED UMC CS, Metabones SB | Vintage FD & FL glass.