rvh23
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Although it can be a pain to have to try multiple copies to obtain a good one ( I tried 4 too), I consider it well worth the effort for this particular lens. If ultimate IQ across the whole frame is your main priority, then once you have a good copy of this zoom, you can pretty much stop looking at anything else in its focal range, and just get on with taking photos instead.
Keep in mind too that most (possibly all) other ultrawide zooms are actually worse than this one in terms of sample variation. The Sigma art lens are well above average in that regard. Many forum members have reported receiving copies that are good across the whole range on their first try, which is unusual for a zoom. Also slight corner asymmetries are more obvious since the introduciton of 60mp sensors. I've found that even some of my best primes that seemed near perfect on 42mp, are often not when re-examined at 60mp.
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. I have to say that the difference of the best corner and the worst corner of the copies I tested or the difference between copies was pretty substantial when viewed at 100% 
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. Now I may need to get a Loxia 21 just for the sunstar and the easy use of filters.
