Yes - The XS20G is an SOC (not SuperHet) - Source: The owner of the only XS20G authorized dealership in the United States - he also designed/spec'd the radio for manufacturing.
I too have a KG905G (a few), KG-935G (several), KG-805G (a couple), multiple KG-1000Gs, and some KG-UV9s... and I can tell NO difference between the XS20G or 935G (both SOC) and all the other Superhet radios - they all receive the same, from everything I can see/hear and from reports from human ears, they transmit the same - the signal sensitivity , although maybe different on a scope - i am not able to perceive any difference.. and the squelch,as best as I can tell, are the same..
...However... i CAN tell a (HUGE) difference in the $30-$50 SOC radios (Retevis, BoofWang, etc) and any of the Wouxun SOC or SuperHet radios - even the BTech 50X1 - huge difference in receive sensitivity and even bigger difference in squelch operation.