I am not sure why Panasonic likes to create lenses with really unusual focal lengths. 15mm, which in 35mm equivalent format is 30mm, is quite an irregular number, and it would have made much more sense if they just have a standard 14mm (classic 28mm equivalent) lens! Since the closest, "popular" focal length is 28mm equivalent, I shall use the lens as if I was composing with a wide angle, 28mm equivalent perspective. Oh dear, wide angle has never been my first choice when it comes to street photography, and I almost always use longer focal lengths, unless absolutely necessary.
This is not a review of the lens, I will need a lot more time to use the lens before I can write a full review. Using the lens for a few hours was not sufficient for me to form a meaningful conclusion. Also, there are already several reliable reviews available for this Panasonic 15mm F1.7 lens. I will also avoid doing any comparisons with any existing lenses from any brand, the last time I did this I suffered through unnecessary bashing, though I was being completely honest. I have figured out that sometimes people just want to hear what they want to hear, so I am shying away from comparison tests and just focus on creating photographs.
The Panasonic Leica 15mm F1.7 fits the E-M10 Mark II perfectly.