Xbox Series X appears to get the more fully featured range of upgrades. Of the three consoles, it is the only one to retain both the quality and performance modes of the last-gen versions - and both are improved. Quality mode targets 30fps with a dynamic resolution window of 1512p to 2160p, delivering the cleanest image quality and highest consistency of any console version - albeit with a lower frame-rate cap. Its performance mode aims for 60fps, achieving it for the most part with a 1080p to 1440p dynamic resolution range.
By constrast, PlayStation 5 gets a single mode, targeting 60fps and doing so at a locked 1200p with 1440p post-process buffers. It's a more limited upgrade bearing in mind that standard back-compat on the existing last-gen code delivered 1080p, but the extra pixel count and post-processing precision is certainly welcome.
Finally, there's Xbox Series S - it's a huge upgrade over the One S version, again targeting 60fps. No resolution metrics are provided in the patch notes, but we're seeing a dynamic resolution window in the range of 720p to 900p, leaning into Unreal Engine 4's temporal upscaling to give the perception of a higher pixel count, most effective in more static scenes.