I have the simple answer to this one. Hand me a FF camera (6D, 5DIII, 1DX) and tell me that I can never shoot crop again and I will be ok with that. Give me a crop camera, even one as capable as the 7D/7DII, and take away my 5DIII and tell me I can never shoot FF again and I will beat your %$#^@ *&%$#. That is the difference. How many here feel differently?
Granted, they're both cropped heavily but tell me what I'm doing wrong with my new 5Diii, please, 'cause I'm not seeing that much difference.
Well, in addition to comparing two heavily cropped images, the 5DIII shot at 1/800 f/7.1, ISO 800 (+1) and the 7D at 1/640, f/5.6, ISO 400 (+0.7). The images you are comparing should be the situation where the 7D beats the 5DIII because you used the same lens, are "reach limited," and you gave the 7D an extra stop of ISO (1.3 with the push). And yet, you are "not seeing that much difference." The different DoF could have also be a factor.
This is almost exactly what I found, even at the same ISO setting. In real world cases where the 7D should be beating the 5DIII, they were very comparable. I did actually create a few conditions where I thought the 7D was slightly better. But, when I took all the different types of conditions that I shoot, the 5DIII really pulled away for me. The obvious example is high ISO conditions. Compare shots from ISO 800 on up and tell me which you prefer? Even in your example, I like the colors from the 5DIII image a bit better. Granted that can be adjusted in post. Speaking of post, have you seen how much better the 5DIII files respond to PP compared to the 7D files? It isn't even so much that you can push the files further (although you can), it is that I like the response of the file better.
Honestly, I do not want to prefer the 5DIII. It is more expensive and, except for photography, I tend to prefer "value" items. So, I'd prefer to still be using the 7D. But, I shot ~35,000 shots through the 7D. It is a great camera. But I do prefer the 5DIII.
If I were to line up the reasons it would go something like this (comparing the 5DIII to 7D):
- Comparing similar images in the shooting conditions I typically shoot, preferred the 5DIII or found them to be even in the vast majority
- 5DIII files can both be pushed further in post and respond better to adjustments made
- While both can use Canon's lens lineup, the majority of L lenses are better suited to a FF sensor (possible exception of the super telephotos)
- AF is better, especially in low light
- I prefer the bokeh from the 5DIII under similar conditions
- I prefer the colors of the 5DIII
- I prefer the noise of the 5DIII, it is a finer grain that is easier to treat in post
- and, of course, I have found the 5DIII has better high ISO performance
Of course, some of that is because the 5DIII was released 3 years after the 7D and had newer technology, etc. I have been watching the 7DII closely and while I am still waiting for reviews of RAW files form production copies of the camera, it seems that it has narrowed the gap in several of the above areas. Considering I am now invested in FF, all that likely means to me is that I am looking forward to similar improvements in the 5DIV.
But, as you have both cameras, if you could only have one, which would you take? For me, it is FF and the 5DIII. Lee Jay picked two 7DIIs.
None of this is meant as a put down of cropped sensor cameras. They are incredibly capable. I continue to see great pictures taken with them and, depending on what you shoot, may be all anyone needs. But, I find the FF sensor to be incrementally better. I am sure MF is incrementally better above that, and crop is incrementally better than 1" sensors and so on. It really gets down to which incremental (or ne.gli.gi.ble) improvement do you want before your needs/wants are satisfied. While I posted to this thread a couple of times, this is not a topic I get worked up about.