Mark Levinson 5000 series vs 500 series

Hello Everyone, I’m currently running a Macintosh mc-452 power amp mated with a c53 preamp. Running an mct-500 transport Panasonic ub-9000 DVD player. Running KEF Blade speakers. Recently I auditioned Mark Levinson 5206 preamp and two 5306 amps bridged mono through some blades. A different sound indeed, but not a total fair comparison due to cables and set up. My real question is that I didn’t get to audition the 500 series. Is there that much of a difference in performance vs price between the two as the price is significantly higher on the 500 preamp. The amps are a wash as I need two to have the power from the Mac. Obviously I would not make a move without home auditioning as this by no means is a cheap proposition and the current system performs. Also looking for experiences with both brands and models from a build and reliability standpoint. As always everyone will have their preference to the sonics. I have not owned Mark Levinson before and I know that a lot of you have much experience with both. Also running audio quest cables. Thank you in advance for your opinions and experiences. The pursuit never dies! Regards Greg 858😎😎