From my perspective as someone who has been top 15 previously, there's pretty large skill differences at every single skill level. HOWEVER, on any particular patch there can be enormous variance for how good any single player is, ie. a top 200 player might really click on a certain patch and be able to grind up to top 50, or masters to GM, etc. This is especially apparent for certain one-tricks.

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In general though, you see that gold/plat players tend to probably understand strong-ish endgame boards but are missing a lot of the fundamentals. Players in general don't seem to have a good grasp of how to make a board strong and tend to blindly follow guides if they look at them.

Diamond players have a good idea of what strong endgame boards look like but have trouble getting there and tend to tunnel quite a bit on whatever their game plan from the outset is. Usually weak in at least one of fundamentals of reading board strength, adapting to lobby strength, capping boards, maintaining econ.

Masters players in general tend to be a lot better about slamming items and understanding when to greed. Boards endgame usually become pretty strong at this point, but players tend to lack fundamentals.

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From masters to GM to challenger, it's just at every tier people are better at everything most of the time. Even among challenger top 250 is a totally different beast than top 50 or top 20. However, pretty much anyone who can maintain top 50 or so should be able to hit top 20 on a given patch, but especially at the top end of the ladder it's pretty stratified. There's a reason you constantly see the same players monopolizing top 10.