9 out of 10 points and recommendedNice bokeh, Fast / accurate auto-focus, Consistent output, Lightweight, Easily interchangeableHeavy, Weak casing
I purchased this lens when I purchased a GH4 (see "The Mighty Mirrorless" review). I am glad to say that this is a great companion for the M4/3s GH4.reviewed November 24th, 2015 (purchased for $550)
From the photography side, this lens is very fast and very sharp. I have had several photographer friend that have made several positive comments on the speed and sharpness that this lens produces. Some of the comments even came from some FX camera shooters. Burst mode of this lens on the GH4 is insanely fast. I have only test the high .jpg setting in burst mode so I'm not sure if the large RAW will slow it down significantly or not. Portraits photos from this lens are awesome as well (see GH4 review for sample pic with this lens). The bokeh has a very smooth finish to it at the f1.4 and I have found that it is consistent throughout the stops.
The video performance is almost photo quality, very sharp and the bokeh is still has the smoothness to it. I have used this lens on some stabilizing rigs and the footage is very usable even though it does not have O.I.S. built in. The focus ring is very smooth and has a good amount of surface area to adjust focus with while following a subject when shooting video. The focus bump is not overly obvious, subtle and smooth as well.
I use this lens mainly for shooting interviews in combination with the GH4 but I have used it for stills on several occasion as well. If you are looking for a very fast M4/3s lens then I would not hesitate to get this lens. I highly recommend it!
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