« on: December 13, 2014, 08:13:22 PM »
I know you don't care for the guy in the video but take another minute and watch it starting at "2:40" this is where he talks about it with numbers. After you see that, tell me what you think.
Well, I swore his D810 infomercial would be the first, last, and only Northrup video I watched. But, in general the higher-end EF-S lenses are often optically better than EF and/or L lenses on the same crop body. The 17-55/2.8 is better than the 24-105L, the 10-22mm is better than the 17-40L, to give a couple of examples. The 70-200/2.8L IS II is one of the best zooms available, but in fact the EF-S 55-250 STM comes close when stopped down to f/8. A lot of what you're paying for with the expensive L lenses is the (usually) fast and constant aperture and a lens that's nearly as sharp wide open as stopped down to f/8.
So, a 7DII with a 55-250 STM comes pretty close to a 7DII with a 70-200/2.8L IS II. But...put that 70-200 II on a 5DIII and the IQ will soundly trump the same lens on the 7DII.
I want the best possible images I can get shooting motorsports mainly panning. My budget would allow the new 7D mark II or I can push it to the 5D mark III with the cannon EF 70-200mm f/2.8L IS II USM Lens. It's a hard decision because it can only be one of the camera bodies.
If 200mm on FF (same as 125mm on your T3i is long enough, the 5DIII + 70-200 II will deliver much better image quality. If you need more focal length, the 70-300/4-5.6L or new 100-400 II on the 5DIII would still surpass the 70-200 II on the 7DII.