FWIW, I've had a 14" pro since launch and have considered selling to get one of these. Main reason is having had a 13" pro at the same time as the 14", despite just being a bit thicker/heavier, it felt like quite a difference in bulk, so it has been on my mind. Plenty of folks say it's a negligible difference... it really isn't when you have both in hand. And the new air will be that much less.
While I sold that 13", still have a 16" for work and I don't feel the screen improvements are really that notable. The only thing still making me pause is the higher brightness screen... w/ a 3rd party utility called Vivid, I can actually boost the screen to 1000 nits in a pinch. This has been a godsend for working outdoor, although it cuts battery time virtually in half.