And what about the quality loss at de-fisheyeing?
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Couldn't download your original file, so I took the JPeG from ksuweh's post then took into PS
There has been a recent thread on CR regarding Nik Software plugin for PS and LR, so I tried Silver Efex Pro 2 in Photoshop -> selected Modern template and Neutral, but then just added a Control Point to the face of the singer (placed the centre of the circle on his nose, then adjusted Brightness, Contrast, Structure, Fine Structure etc.)
Basically the problem area is the two-tone shadow on the singer's face. This is precisely what Nik Software plugins are designed for - to edit localized areas of the picture without destroying the rest of the scene.
I really like the Fine Structure detail option as it allows the face to really pop-out (eyebrows, nose etc.) and is great for fixing soft focus too. Finally, I reduced the image size to make it acceptable size for upload.
The current version will be replaced if Canon sees any need - and current corporate policy obviously means that...
* a) another 3rd party manufacturer for Canon has something better (currently not the case, Sigma 50/1.4 is nice but lacks the ultra-thin dof and bokeh, maybe it'll be different with a Sigma mk2)
* b) the competition, i.e. Nikon has something better so people switch brand (like with the 24-70).
... otherwise Canon will keep on selling the thing until nobody wants to buy it anymore, which will never happen given the hype/prestige of this lens. Btw Same goes for "when will they release the 35L mk2?".