okay so shadow embrace stacks twice and I forgot twin discipline...that puts both Warlocks and Shadow Priests at 50% extra damage, the only difference is Corruption will scale better with gear because of the higher coefficient, I don't really care either way, I'm happy with my SPriest and whoever calculated a 10k corruption I suggest you learn math for next time.
Another thing not touched on is the fact that since mindflay constantly refreshes SW:P they won't have as many missed ticks...the Damage per mana on it is crazy. You cast once, and keep it up, a warlock has to either recast it before it wears out, or cast it after it wears off, unless his/her timing is PERFECT over the duration of a long boss fight, they will be shaving a few fractions of a second each time...in the end I prefer SW:P
Oh and I don't give a crap about PvP, it will never truly be balanced.