I've had a few over the years and like you sold them off for other things but a few months ago bought a used '16 locally. Sounded like most good J-45s sound. Action was low and the guitar had no "issues".
I feel it plays and sounds just fine. I was never a fan of adi nor baked tops so a Standard was what I was looking for.
Swapped out the Grovers for Klusons and replaced the flubber guard with one from Taylor Mullins and I'm good to go. Haven't done anything with the internal pickup, doesn't bother me. Same for the nut and saddle.
In general I think most modern J-45s are consistent. As folks say, better to play before purchase but if that opportunity doesn't present itself I'd feel confident with just about any J-45 these days.