I have had several carts in the 8 to 10k segment playing in comparison to PP-2000, like Fuuga, Sumile, MSL Platinum, TechDAS, Azule, Anna, Hyperion and more. The PP-2000 plays easily in this segment, if paired with T-2000 step up. Kondo SFZ is a little limiting the PP-2000 (at least in my set up).
Going from PP-2000 to PP-5000 is a big step from 5k to 15k eur, and PP-2000 plays like costing 8 to 10k and PP-5000 is well placed in the 13 to 15k segment, which gives to PP-2000 an extraordinary value and to PP-5000 a fair value.
I prefer the PP-5000 over the Etsuro Gold, if it comes to resolution and attack, the Etsuro likes the little nuances and has his benefits in this regard. Maybe my PP-5000 will develop more into this direction, as it is not fully burn in.
On Kuzma Safir 9 the PP-5000 was a little brighter in tonal balance, as PP-2000, similar effect to Koetsu, when going to diamond cantilever. Changing to Glanz MH-124s or MH-1200s tonearm and using the new Phasemation 1200 DLC headshell, the PP-5000 was playing well balanced and very nice. In a direct comparison I preferred the Glanz / PP-5000 pair over Kuzma Safir 9 / PP-2000.
I a friends set up the PP-5000 is now fitted to SME V-12. Phonostage is AR Ref10.
We changed the step up from SFZ to T-2000, which was much better combination.
If you try PP-5000 you should give the T-2000 a try as well. Your Onyx will like the T-2000 as well.
Some of your carts still will prefer SFZ