I've only had limited opportunities to use this lens so far, but my first impressions are extremely positive.
The value for money is simply unbeatable. Despite its remarkably low weight, the lens feels solid and well built, with an exceptionally smooth and pleasant focusing ring.
Optically, it has exceeded my expectations. Sharpness is remarkable, even at wide apertures, and chromatic aberrations appear well controlled, including in challenging night photography, where I've found its performance particularly impressive.
The combination of a bright f/1.8 aperture, autofocus, compact size and excellent optical performance makes it a very attractive option for the Fujifilm GFX system.
It's refreshing to find a lens that delivers so much without the usual weight and price penalties of medium-format optics.
Highly recommended, especially considering its price.