"CHROMATIC ABERRATION: None whatsoever! This is the second, astonishingly good trait of this lens! No other wide-angle lens I have ever tried has pulled this off, not even the ZF 18 (which shows traces of CA in the corners). Kudos to Samyang."
"…it is also a hair sharper than the Zeiss 18mm prime (believe it or not), and unsurprisingly it is way better than both Nikkor primes…"
"Photozone comparison shows the samyang to be slightly sharper than the canon, which is amazing. It also has a little less vignetting stopped down. Both do very well with CA. I can tell you that the microconrast and color are as good if not better than 16-35 2.8L II."