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Just been playing with my dads 7d and my 6d, both with my canon 24-105 L and i have to say the IQ is better on the 6d, the focus speed is (marginally / subjectively) better, the colour rendition is better, the low light is better....... but as said before the af speed is better on the 7d with tracking moving objects..... but that is it, please know that if your buying this camera you're not buying it for its sports/ wildlife/ action capabilities!
It is great but you have to have patience and learn what it can do and how to use it capabilities, not think, oh the 7d this, the 5d3 that.... you have to think, the 6d is.... and you know what, imo, the 6d is amazing!
Im no pro, i do not take pro shots, i take hobbyist shots. The 6d is great and i love it
**rant over**
The 6D does indeed comfortably out-resolve the 7D when both wear the 24-105, but this is largely due to the glass. My 17-55 IS comfortably outperforms the 24-105 on a 7D. I have owned two 24-105's, so know this is not down to a rogue example. I am sure it helps that the 17-55 was designed for the 7D. For center resolution the 17-55 is sharper at F/2.8 than the 24-105 is at F/4 on an 18MP APS-C sensor.
So, for me a fairer and more real-world comparison is 7D + 17-55 vs 6D + 24-105. These are two very common combos with both lenses costing similar money. F/2.8 on a crop provides very similar results to F/4 on FF. IS is very similar for both combos (both work well), and IMPORTANTLY, F2.8 wrestles back one of the 2-stops high-ISO advantage that the 6D holds. With this combo the 6D holds an effective one-stop advantage and DOF is equal.
I think that I have be spoiled by the almost perfect pairing of 7D and the 17-55. I am pretty sure that I would feel the same way if I have purchased a 5D3, or even a 1DX and mated them with an F/4 lens. If I had come from a 7D with a kit lens to the 6D/5D3 with a kit lens I would have been blown away.
I am not knocking the 6D. I fear I have acquired a taste for fast glass (which is a damned site more expensive on FF).
Having said all of this I can conclude that the 6D/5D3/1DX really need F/2.8 to force home their true sensor advantage. I better start saving for that 24-70 mkII.
edit: It is a little unfair for me to judge the 6D on the strength of how good the 7D works with the 17-55 F/2.8. I have also played with both cameras using my 70-300L today, and the 6D easily beats the 7D for IQ here. Being the same aperture, the 6D retains it's two-stops high ISO advantage, plus it has much more pleasing bokeh due to narrower DOF. I will keep the 6D (warts and all), but I need that F/2.8 on my walkabout lens.
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