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My understanding is that plasma panels have a native resolution, similar to a LCD panel. If that native resolution isn't the same as the input resolution, there's typically a scaler in the plasma display that will massage the content to fit, very similar to a LCD panel.

Plamsa panels were commonly available as 1920x1080 or 1366x768. As long as you're watching natural images (movies etc), both are really fine; native 1080 line plasmas are a better fit for computer generated imagery because they're much easier to feed at their native resolution and avoid the scaler; a lack of 4k plasma displays isn't really a big problem, 1080p is still beautiful. Plasma screens don't have support for HDR, but they do have amazing black levels.