When I was looking for speakers I really wanted the SF Cremora Auditor M. Just had to save up a little more. Then I heard the Dyn original C1. Well that was the sound that eeked out the SF. My only complaint with the C1 is they needed to turned way up to sound their best. When Dyn came out with the MKII/Sig I bought a pair of sig's without even hearing them (got one of the first 5 pairs in the USA). Turns out they upgraded the crossover - internal wiring and put a new doping on the tweeter. To my surprise they sounded a lot better at lower listening levels. Never heard the Platinums side by side so I'm not sure if there was any change in SQ. So personally I would go for the MKII/Sig version if you can find them. That said the originals will play a bit louder. IMO the SF and Dyns are very similar in SQ with the Dyns having a slightly better midrange and a touch more dynamic.