I see you already answered your question yourself. Pretty steep, no? Especially in light of the fact that you can get the SS for little more than half of the AKR02's price these days.
I've been wondering and inquiring about potential sonic differences / improvements on the AKR02 vs. the SS, but nothing conclusive has come of it so far. Now they've hit the shops in Europe and curiosity got the best of me, lol. Well, I've been frank with the dealer about my intention to A/B them to the SS and he offered me money-back guarantee, so it's pretty much a no-brainer to take the chance and compare them side by side.
As for redundancy of the SS next to the K3K, I'd say these are sufficiently different to warrant having both, if you can afford it. Two of my all-time favorite IEMs.
(Click the K3003 link in my sig for a short comparison.)