Originally posted by joelR Sony seems to really go for center sharpness almost at the expense of corner performance.
I haven't noticed that - and I own ALL the released E-mount lenses except for Zeiss 24mm and the 18-200mm (too heavy for me). [Caveat: I have bought the 50mm f1.8 but it hasn't arrived yet so can't comment on that one]
Even the 16mm with wide/fish converters deliver acceptable sharpness into the corners. The kit zoom seems to be pretty good for a kit lens.
What I HAVE noticed is that the corners have a fair amount of CA if uncorrected. The camera does correct for CA if you let it, but if you capture Raw, then there's a lot of CA smearing on the 16mm especially if uncorrected.
Also excessive PP can accentuate the CA if uncorrected.