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ORAS on the left, Masters on the right
there's obvious texture and model size increase (calem has finger nails now! and his fingers are much more defined), his pants have modeled pockets for some reason, the glasses are 3d instead of being a flat plane with textures and the boots have modeled buckles
the only downside I see from the masters model is that he lost his hair texture, it's plain and somewhat lacking now, but it's a really good remaster of an already decent model (btw in ORAS, calem has a regular watch instead of a mega ring)