Alright, guess I need to think about it. 6700k and 5820k does more or less have the same pricetag after all, but overall 5820k should be more powerful (if we take aside the budget-friendly 6600k). I guess I shouldnt go by the idea that just because Skylake is the newest is must be the best.
If you are choosing between a 5820k and a 6700k that's as Kevin Bacon on EE's advert in the UK would say, "a no-brainer"
Choosing between a 6600k and a 5820k is like comparing a Fiat 500 to an Audi A4...
The only downside I see from a 5820k is you appear to be using more power especially when overclocked..