Raul, with respect, I have to disagree on the gt750. It’s not in the same league with TT81 by most accounts. And you said it yourself: the manufacturer published specs are not meaningful for comparing two products from different companies. Also the Yamaha tonearm on the gt750 is very suspect, partly made of 1970s plastics. The gt2000 is top notch, no doubt, and comparable to TT101, but the gt750 is two big steps down. GT2000X is probably in the big leagues with P3, SP 10 mk3, L07D, etc
By the way, ALL the Japanese DDs with coreless motors borrowed heavily from the design of the Dual coreless motor of the 1960s. The Kenwood, Victor, Yamaha, Pioneer Exclusive, and even the recent Brinkmann coreless motors are similar to each other and built just like the Dual if you take them apart. (I’ve done it for Victor and Kenwood motors and seen photos of all the others.) Kenwood and perhaps other companies were actually sued by Dual over this issue back in the day.