Seconded. In fact, Op.2 No.1 is the only one Scriabin wrote that might even be grade 6 or 7. Most of them are well above Grade 8.
After that come the two other slow etudes, Op.8 No.8 and Op.8 No.11, both of which have some rather tricky polyrhythms (Scriabin just LOVED polyrhythms, didn't he!)
Phil