Hmm, are you sure they are ABS dye sub? As far as I know, all dyesub sets are PBT, due to the porosity. Most (All?) IBM/unicomp are dyesub PBT.
Personally, there are some ABS keycaps that do have a good texture. The right shift in hashbaz's white legend RGBY set is an excellent example of this. That said, In almost all other cases, I prefer the PBT texture. I also like all the Dyesub sets I have (I've inspected them closely, and don't see any blurry or fuzzy edges. I imagine these arose from IBM/unicomp reusing the printing sheets too many times: all the custom PBT dyesub I've seen is top notch on sharp edges). I also like PBT's wear resistance. I have nothing wrong with worn/shiny keycaps, but I prefer longevity on principle.
Both the "Daily Driver" keyboards I use have all PBT keycaps (save the one spacebar).
I haven't used keycaps from Qtan's store, so I can't comment, other than to say that they should be great.