Quick review/impressions:
1. Really nice build quality. Metal body (with plastic mount, I think) that is finished to resemble glossy plastic.
2. Focus ring feels better than SEL1855, SELP1650, but damping is quite heavy initially (seems to be getting lighter over time). Definitely not as smooth as SEL24F18Z.
3. The focus ring "sensitivity" (amount of turn to change focus) is a lot lower than other E-mount lenses IMO. Requires more turns than it should.
4. The stepping motor in this lens is very nimble. Focus speed is very fast in good light and when subject is at least a metre away. Feels as fast as SEL24 with PDAF. In less ideal conditions, seeking is quite swift, though not as decisive as SEL24. Can't imagine how much faster this will be if a PDAF firmware update becomes available.
5. Sharp output from this lens - center's good from f/1.8. Corners quickly improve when stopped down. Not much complaints, really.
6. Interesting lens design that uses concave front and rear elements. Lens design is completely different from SAL35F18.
Purple: Aspherical elements. Green: ED (Extra-low Dispersion) element