Dollar for dollar this may be the best lens in Sony's full frame line-up. I've grown increasingly frustrated with Sony, their release-a-slightly-different-version camera every six months philosophy as well as their extremely poor QC issues with many lenses (want to know how many different 24-70 f4 samples I tried and how wildly varying the results were - none of which were satisfying and I did not purchase it in the end). On the other hand, the FE 55 1.8 lives up to its legend, and while I have yet to try it, many say the Sony 85 GM edges out the superb Batis 85. In general, the Batis, Loxia, and (for APS-C) Touit lenses overall have significantly better QC.
Point being, Sony is all over the map for me when it comes to the quality of their lenses. I'll never purchase a lens they make when first released (even if badged with the ZA designation - Sony is still responsible for 90% of that). I made that mistake with the original, cheap FE 50 1.8.
This lens however, is fantastic, and from all the positive reviews I've read, QC and sample variation is not even close to the issue it is on many other lenses. Construction is good, feels solid and yet is not heavy - balances better with an APS-C camera than a full frame actually. I don't much care for the filter threads, which make it nearly impossible to install a polarizing filter (unless you already have a UV or some other kind of filter installed).
Image quality is wonderful across the board. Focus is fast even in low light and minimum focus distance is surprisingly short, just shy of one foot.
All in all, there isn't much to complain about here. I could nitpick here and there, and I could talk about how Fuji continues to dominate with their lenses when it comes to quality and price (most of their primes are the same or near the same as this lens - one of the cheapest FE offerings, and Sony's line up comes nowhere near Fuji in across-the-board IQ). But in the end, if you have a Sony system, particularly full frame though due to the low cost and small weight/size of this lens, APS-C as well - do yourself a favor and pick one of these up.