The first genuinely compact--almost pocket-friendly--compact system camera, paired with equally small, interchangeable lenses. Great ergonomics for the size, and it feels like a real camera, not a computer with a lens.
Very restrictive lens selection at launch. All but two current lenses have severe limitations in functionality. Performance is sluggish, and image quality trails large-sensor cameras by some distance.
Very good image quality, Improved high ISO performance; Improved handling; Faster 8 fps burst mode; Burst rate no longer slows down with RAW files; Improved buffer depth.
Soft corners at wide angle; No viewfinder; No 4K video; Mediocre battery life; Sluggish buffer clearing; Continuous AF struggles on fast subjects.