It's worth noting that Louis' shots were most likely taken with a 5DII, not the 7D.
The 7D has a much higher pixel density (the 5DII has the same pixel density as the old 20D at 1.6 crop size) and is going to be far more demanding on lens performance. That said, I've only seen that sort of abberation on my 15mm fisheye and then only at the edges, centre is clean, doesn't look right to me.
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