Fully upgraded Rega P3 vs P8

Once again, I'm seeking advice from you guys.  I want to first say that I really appreciate all the helpful suggestions I've received here.  I don't really participate much except to ask questions but I'm just eager to learn.

I have a Rega P3 with pretty much all the upgrades:

external power supply upgrade
white belt
groove tracer reference subplatter
groove tracer delrin platter
groove tracer counterweight
Apheta 2 cartridge (I got this at an incredible discount so I couldn't resist)

First I should say I realize I should have saved my money on all the upgrades and bought a higher end tt to begin with but the P3 was my first serious tt and the upgrades were part of my journey

I have a feeling that with all the upgrades I have met and perhaps surpassed the performance of the P6.  I'm wondering if going to a P8 on an RP8 would yield a significant upgrade?  I realize that my table is outmatched by my cart.  I'm loving the sound right now and I don't have the itch to upgrade.... yet.  I'm just curious to see what folks think?  

thanks so much