wlmsn Not sure, but I suspect that there's probably a higher chance that the 16" models have better quality control and are more often shipped with the "good" panel.
I remember seeing two 14" MacBook Pros next to each other a few months ago where one looked bad like mine does, and one looked way better, so I think it's definitely possible that there are some of the smaller 14" models that actually have good screens — but it may be more rare.
Someone on MacRumors also said that they had a bad experience with hazy feeling text on their 14", had to exchange it five times(!), and then finally got one where they immediately noticed that the colors felt uniform and text was way easier to read. (I can find that forum post if you want to see it…)
I've also seen some people here say that they had a really bad experience with the 16", so likewise it's definitely possible for the 16" to have a bad panel too. (I'm actually surprised with your comment about the 15" Air, since a lot of people on this forum say that they're actually having worse experiences with the 15" M2 Air compared to the 13" M2 Air if I remember correctly.)
I'm generally confident that this is primarily related to a "panel lottery", due to the fact that Apple has at least two mini-LED suppliers:
- Taiwan-based Epistar
- Germany-based Ams Osram