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 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 2.0x III, 70-300L | E-mount: SY12 f/2, 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses