I swear by Voigtlander lenses. In my opinion, there is no better investment in the micro 4/3 format. I bought my first Voigtlander for my Panasonic GH3 and it's followed me to my Blackmagic camera.
This is a full manual lens. There are no electronics. That means no auto focus and no auto exposure! Keep this in mind if you're a beginner!
This lens is fit for high end video production.The focusing is buttery smooth with hard stops at the ends and just the right amount of resistance. It's all metal and glass so it's feels nice and heavy in your hand. I accidentally dropped my 17.5 mm from a height of about 5 feet onto a wood floor and it was fine. (Though I wouldn't recommend doing it on purpose!)
Optically, it's outstanding. There is a noticeable difference between these and kit lenses. Especially in low light. This is a very fast lens, though it's a little soft when wide open. That being said, if you find yourself in a situation where you have to shoot at .95, tack sharpness will be the least of your worries. IMHO.
I have a set of these and they are consistently excellent across the line. They're expensive but your lenses should be the biggest investment in your camera bag. There is no accounting for quality and piece of mind. These lenses deliver that in spades.