I know nothing about the Technincs keyboards, But as i said before, this (SX-PR804) is our 2nd Technics Digital Piano. We Chose this over a standard Piano, and over other Digital Pianos, for many reasons;
Limited to no tuning, Similar Key play to an actual piano (Similar, not exact!)a great sound system built in, but the main reason was the amount of great sounding Pianos on the instrument. You name it, it has it plus Piano and Synth sounds that boggle the mind.
The dis-advantage is in the operation. It is not very user freindly, but neither was the Roland that we were looking at. There are days that we want to trade it back in, but we are learning the system, having patience, because as BEBOP put it, it does everything, it just may take some work figuring out how to do it, and of course the help of some very talented musicians on this site!
Indy