Sofronitsky's is a helluva lot more than "interesting", and there actually is a complete recording.
#4--Hamelin
#7--Hamelin
#8--Hamelin
#5 Laredo (conveys the idea in the sound)[/url]Hmm. I think it's her weakest performance of a Scriabin sonata, although her 8th is a sleeper and the 4th is frivolous in the second movement. I'll have to listen again, perhaps. Have you heard Hamelin's? It's closer to Horowitz's performance than the others, although strangely clumsy in a crucial place (a place Horowitz plays well). I prefer Taub's performance to Hamelin's, though.
It would be hard to add to what has already been said. I'd agree by suggesting that Ashkenazy is rather dull (I was deeply underwhelmed, also, by his Rachmaninoff Preludes recently)
He did an outstanding job with the original version of the 2nd sonata. I agree that the preludes are lacking, though. Once again, Horowitz stands high above.