Musical Fidelity A5CR Pre Amp Upgrade from A3CR

My system is as follows :

VPi Scout/JMW9
Whest Ps.30R Phono Amp
Musical Fidelity A3CR Pre Amp
2xMusical Fidelity A3CR Power Amp (Bi Amping)
ProAc D15 Speakers
Nordost Cabling

I would like to upgrade my Pre Amp and also have HT Bypass, a 2nd hand A5CR Pre Amp interests me.

Unfortunately I cannot find any information on how they compare and cannot demo the A5CR.

Does anyone have any experience with these amps?
I'd love to know how they differ and if it would be a worthwhile upgrade.

Thanks in advance.
I ran an A5 pre pwr sometime back. I compared with Audiolab Q and the difference was night and day much much more transparent. The combination also bettered the A5 int by some margin. Not heard the A3. One thing that was a surprise I found that the A5 pre responded to changes in power cable more than any component I've tried before or since.