Can't speak of the W800, but the Modern Classic is essentially just a Silver Jubilee with an added gain stage in front of it - the tone stack is a little different too but that's about it. Finished my MCII clone back in April this year, or to be exact gutted a DSL50 completely and rebuilt it as a MCII, and it's my favourite amp at the moment. Bought and sold a genuine Wizard last year and the clone is every bit as good imo - at 1/5th of the price. Actually the clone is a little more Marshall-esque in the mids, but the real Wizard was an older MCI from just before he came out with the MCII and revised the circuit a bit. So who knows if it's the slightly different circuit, or my transformers which are obviously not 1:1 identical (not even the same brand).
The only Fractal product I own at the moment is the FX8 MKII, so I can only speak from a real amp perspective - but nothing else is like a Wizard. It was the first real high end amp I ever tried and I genuinly think it ruined me for other amps in many ways. I have other killer amps too that I have even modded and fine tuned to my ears and preferences, but the MCII clone is on another level. You kind of have to play it to get it, which is why I'm not sure how well an amp like that will translate to a modeller. A big part of that amp's uniqueness is the massive thump and responsiveness when you play it in the room, I can't even get that fully through when recording it. And the gain knob WORKS, no bright cap so the core tone is the same whether you have gain on 2.5 or 10!