I replaced my trusty RXV3300 with a RXA2060 at Christmas and I definitely believe the class D amp section is a little weaker than the class A/B old amp even though specs say 10w higher not lower.
Don't be so sure. Older may not be better!! As far as I know the RX-A series are still based on class AB amps. The RX-A2060 weighs 37.5 lbs, maximum power consumption 1210 watts, that's typical of class AB, not D.
Also, if the RX-A2050 that has almost identical specs (output, consumption, and weight) as the 2060, was benched tested by S&V with respectable power output specs up to 5 channel driven.
Two channels driven:
177.6/200 watts @0.1%/1% THD 8 ohm loads
251/314.7 watts @0.1%/1% THD 4 ohm loads
Five channel driven:
101.4/111.9 watts @0.1/1% THD 8 ohm loads
The two channel driven outputs are comparable to that of the RX-Z9, better (more power output) than the much older RX-V3900, so by extension, most likely better than the RX-V3300.