Sigma 24/1.4
If so, then ouch
Canon EF 50/1.4 or 35/1.4
http://flickr.com/ephankim
Over at Sigma rumours I just saw an article about shooting an air show with just two primes. 70 mm macro and this 24/1.4 Art lens.
<a class="bbc_url" href="http://sigma-rumors.com/2015/07/shooting-airshow-two-short-prime-lenses/">http://sigma-rumors.com/2015/07/shooting-airshow-two-short-prime-lenses/</a>
Corners are overrated anyway if using it wide open. I've be been using it the last week on a couple of lowlight occasions and am pretty happy with it. Didn't compare directly with my 5 year old Nikon. Yet. But the weaker will go into sale and I'm guessing that won't be the Sigma.