The Sony FE 12-24mm f/4 G lens has already released, and currently in stock and shipping at Amazon/ B&H Photo/Adorama. Sony Artisan Colby Brown has complete the full review of this lens, and said that this lens is great ultra-wide zoom lens, it offers both great IQ and near corner to corner sharpness.
Conclusions from Colby Brown:
So how is it? For an ultra-wide angle lens, it offers both great IQ and near corner to corner sharpness. Distortion is very minimual and the sunstar is definitely a step up above the 16-35 f/4 (that I am now retiring). Lastly, astro photographers will be happy with both COMA and astigmatism, especially if they pair this lens with the a7S II that can easily handly pumping up the ISO to counter for the fact that this is an f/4 lens. But once I got the hang of it, it quickly became one of my favorite lenses.
the only downside of this lens is the fact that you can’t easily use filters with it.
PROS
– Great Image Quality
– Impressive Corner Sharpness
– Almost no COMA for night photography
– Lightweight and Portable
– Quality Sunstars
– Minimal Distortion for an Ultra-Wide
CONS
– Bulbuous Front Lens Glass Element = No Easy Filter System
– f/4 minimum aperture for night/astro photography