Newcomer to anything beyond compacts, picked up an OM-D E-M1 with the 12-40mm PRO. While I wait on the telephoto (end of 2014 *sigh*) considering what else I can pull into the kit... Been reading a little about primes and they look nifty. Ultimately, digging that common perception is you're copping a faster and sharper lens as you don't need to cater for multiple focal lengths. Figure purposes include landscape, street and something close to macro if possible (uncertain if I'll step outside of Olympus' PRO range: unsure if I'll fetch the 60mm macro). Who's familiar with both the Sigma DN Arts and the Voigtlander Noktons? Is there a use in picking up a trio in either? Does anyone carry around a standard zoom and prime when they head out and about? How flexible is any single given prime lens?