Originally posted by BostonUKshooter The new Fuji GF 23mm f4 R LM WR Lens for the GFX is said to be equivalent FOV to 18mm on 35mm full frame.....so not that much 'better' than the 25mm Pentax DFA lens, which is approx. 19mm on FF 35mm?
As you get wider, each additional mm adds a more significant amount of FoV, so going from 25->23mm is a big difference. Of course the GFX is also a mirrorless camera, so it has the advantage when it comes to WA lenses, in terms of size, weight, ease of design, etc. Even if Pentax comes out with something to compete on a technical level (also a 23mm f/4 for example), it'll still end up being bigger and more expensive.