I may be a bit biased here, considering I prefer the 50mm FOV over 35mm FOV; so, I won't minus more than 2 stars. This lens's AF is as quick as you can ask for and for 35mm FOV lovers, this lens would get 90% of your shots done just fine. My gripe with it is with the sharpness, CA, and nervous bokeh balls.
I'm not a pixel peeper, but the lack in sharpness when shot wide open is quite noticeable when compared to the M43 prime jewels that I've shot with, i.e.: Lumix 20mm, 25mm (f1.4), Olympus 25mm, 45mm, and 75mm. However, if you step down a stop or two into the M43 sweet range, it'll be on par with the best of them.
The CA is present only when shooting raw, and easily fixable in post a majority of the time. It's also not a problem if you're a JPEG shooter. There's just been a couple of times, that the CA was so bad, that fixing in post wasn't a possibility, this may make the difference of having that one perfect shot be less than so.
Out of focus lights in the background, when using this lens, can be quite a bit distracting from the main subject. It's not a huge concern for most, but I personally appreciate the smooth buttery goodness of nice bokeh balls! Mind you, this may also be partially due to the focal length mixed with the CA issues I mentioned above.
So, in all, this lens a great tool for what it has to offer. If you need a quick focusing fast 35mm FOV lens, it'll be faster than the Lumix 20mm, closer to an actually 35mmm FOV than the Lumix 15mm, much cheaper than the Nokton 17.5mm, and not much more spendy than the slow 17mm Olympus pancake.