Firstly, I am only comparing ABS double-triple shots here.
short answer is, yes, GMK is still king in the ABS game, worth the money and wait.
Now allow me to elaborate:
There are quite a few new ABS cherry style brands in China now. In my opinion, their prices matches their quality. I rank them by quality from high to low, Domikey, JTK, Aifei.
Domikey starts offering double shot and triple shot ABS cherry keycaps since 2021 and I have to say, they are very good quality keycaps. good material with thick walls. The surface is better than GMK IMO, and they changed the nasty injection port to the bottom of the keycaps which is sadly, still on the back of GMK ones. They are prices just below GMK ones with one major weakness: small legends tend to have various legend stroke differences, consistency is not good. Other than that, great keycaps.
JTK is second in the game here in China, but I do not like the touch of their surface treatment. Great legends, though. And JTK is notorious in delivering their keycaps on time, well, slightly better than GMK.
Aifei is the most sold ABS keycaps here simply because they are cheap knockoffs of the GMK ones. They sell by thousands because they are cheap yet the color of those keycaps matches perfectly to the GMK originals. The typing feel is miles away from GMK but they are also 1/8 the price of the original GMK.
In conclusion, if we put aside the 18-month lead time of current GMK sets, they are still worth the money as the best ABS keycaps you can buy right now. But other manufacturers are catching up fast, both in quality and in price.