There seems to be definite increase in performance albeit minimal, compared to the H50 or any other high-end heatsinks available in the market. If Corsair prices this close to the 5k mark, it would be a sure shot winner.
^^ The H50 out of the box though is an above average cooler and you need to spend on fan(s) making it cheaper than the H70 by only ~$15 and still the H70 beats it by a decent margin.