I'm very much digging this little gem. I will however get a 37mm to 46mm step-up ring so I can have consistent filters across my small primes. But I see this lens getting a lot of use around town.
The best part? It's so small that it can just be tossed in a pocket along with a battery when I'm out shooting with the 17mm. I could totally see eventually getting one of the Laowa UWA's (7.5mm or 10mm) for an ultra-compact and tiny 3 lens kit that fits in a small belt pouch or large pocket when paired with an E-M5 series body.