Holy crap, those are impressive numbers. I remember Wiggo saying he could do 475w for 30 minutes on a climb but obviously he didn't back that up with any actual data so could just have been posturing.
My best is 290w at the same weight, only 144w to go.
I reckon 5w/kg will get you near to the top riders on a long hill climb here, but that's still a way off where I'll probably ever be.
To keep it on topic, I'm retesting this weekend so will be interesting to see how things are going. CTL up at 47.5 from around 30 mainly doing sweet spot work with the aim of being around 70 for the start of TT season proper. I'll be doing SpoCos from late February though to keep things ticking over.
This is the first time I've ever done any sort of structured training so I'm hoping to see some decent gains by April time. Provisionally going to Mallorca in mid-April too so looking forward to that too.