Rogue Rap-1 to RP-5

I own RP-1 and am contemplating an upgrade. Looking for opinions from those who have compared the two preamps (RP-1 and RP-5) side by side or stepped up to RP-5. Is RP-5 a noticeable improvement? What about the phono section (already excellent in RP-1), is it an upgrade as well?
Amplifier is Rogue ST-100, Bryston BDA-3 DAC, Rega P2 table with Hana EL cartridge, Martin Logan Montis speakers.