I have had the vsx-lx303 for about 6 months now and I think it does a great job in a 5.x.4. Pioneer uses the universal crossover, so that might be something to take into consideration- mine is set at 100hz, which works well for my sony core bookshelves. If you have towers and run them full range, or set 40hz, 60 hz crossover, the vsx-lx303 might have trouble with action movies at high volume. But, coming from a 5.1 sony str-dh550, the vsx-lx303 has been a revelation: atmos (and dts neural x upmixing) have been surprisingly great in my 7 ft tall room.
Viewsonic PJD7828HDL, DVP-5000S, 105" DIY AT Screen, TCL 65R615
5.1.4- Pioneer VSX-LX303, Sony SS-CS5 x4, Sony SS-CS8 x1, Micca M-6C x4, Martin Logan Dynamo 1000
Samsung UBD-K8500, Roku Premiere+, Playstation 4 Pro, Nintendo Switch (Original Model)