Got my Sapor today and put it up against the Hastur, both with dual twisted 28ga coils, 8 wraps at 2mm. Vaped at 65 watts on an iPV3. Both don't leak, both have great flavor; the Sapor has more airflow at its wide open setting, and it also does not spit back at all. Plus you can't accidentally cover the airholes with your lips on the Sapor. Vapor production and throat hit also go to the Sapor. The Hastur is smaller and looks better to me, especially on a mech.
All things considered, I'm getting a more satisfying vape experience with the Sapor. Not by a whole lot, but enough to make it a clear winner IMO.