I can't say I've compared them but I have the SC-LX501 and the sound reproduction is on point. I went into a BB Magnolia Home Theater room a few weeks back and compared my SC-LX501 against the Denon X3300, Marantz 6011 and Yamaha RX-A860BL, to me the SC-LX501 sounded superior.
You can't go wrong with Pioneer Elite's and the Class D3 amp, runs cooler and has a fuller/warmer sound that I prefer.
TV: LG OLED65B6P
A/V Amp: Denon AVR-X6500H
Speakers: Towers = Martin Logan Motion 40's (bi-amp), Center = Martin Logan Motion 50XT (bi-amp), Sub = Martin Logan Dynamo 700
Speaker Wires: KnuKonceptz Kord Kable 10 Gauge Copper Speaker