The Hagia Sophia pre-patch would actually be capable of producing more free wonders than the new one, to be fair. Yes it didn't produce it instantly... but that +33% could be turned into many extra GEs than just 1. Also it could be used before to grab many extra techs via extra GSs.
I know that an extra +33% GPP generation != +33% extra GP... but it comes close if you have enough cities dedicated to it. So I don't think it is out of line to suggest that over the game that extra +33% could generate you 4 or 5 extra GPs. So now it actually generates less but gives you a free GP. So I think its kind of a wash. It's not better or worse (on an entire game scale). Now because you can time and select that first GP... well that might boost it up a bit. But I'd argue you could get a GE about the same time by aiming for metal casting and building a workshop about the same time. If the HS didn't give a GP then it would barely better than building a garden in cities that you want GPP.
Depending on how RAs ultimately work, it will take at least 24 landings to get that 6 extra free techs from the PT. And if they are targetting expensive techs (or random techs) it may take even more to get a free tech from it. GSs can be used to target very expensive techs anytime they are available. So generating 4 or 5 extra GSes may actually be much more powerful than boosting RAs.
These numbers are rough and may not refelct your actual playstyle. So boosts from HS and PT may vary
. However it may have been a very wise idea on the part of the devs to limit the production of GPP via +%s as they may very well be the new power teching option.