Are the delays, reverbs and chorus in the G-Major of the same quality as in the G-Force?
Yes the sound quality is as good as the G-Force.
Please note that the pitch in the G-Major is not an intelligent pitch shifter like the one you'll find in the G-Force.
Also, regarding FX routing, there are 3 fixed routing options in the G-Major whereas in the G-Force free FX routing is available. But yes, the efeects sound as good as the effects in the G-Force.