[JJ_SO]

Well, the field curvature is somewhat eaten by the increased DoF towards infinity.

But again let's be fair - 3-4 years ago, the Sigma would have been cheered regarding its performance.

I'm pretty much convinced that the D850 will produce similar figures. Most Sony FE lenses have also issues on the A7R II.

 

If 3-4 years ago Sigma would have been cheered, then who's cheered today?  Maybe it's just me, but I'm not aware of any other 14 mm lens with that quite high center and close center performance. If I need sharp borders. I'll stop dwon anyway, but I really want to know a single case or subjectwhen you need high res corners wide open? In my book there's none of this subjects.Not even in theory.

 

Okay, once I used the Zeiss 12 mm on the Fuji to get some shots in an exhibition just with less reflections.

 

This one can do with a Fuji, with a 2.5 kg FF combination the guards usually jump quickly - but even for this purpose - no reproductions but some memories - that lens will do just fine, as most pictures/paintinings are lit sufficienty to view them.

 

I want to know, Klaus, when you need high res corners wide open. To me, your verdict appears not realistic and at the same time you did say only one single word ("It's not a wonder lens in terms of flare/glare but that applies to many lenses in this class anyway.") about flares - these matter more and compared to the Nikon 14-24, that Sigma IS a wonder lens (most others are so, too  ^_^ ).

 

Edit: Oh and by the very way: The Nikon got 4 stars at it's time. At 14 mm and f/2.8, it is in no respect better than the Sigma - not on 20 and especially not on 45 MP!