A part from the badges, you can't tell Fujifilm's two X-H series mirrorless flagships apart because there aren't any physical differences… the X-H2 and X-H2S share exactly the same body. On the inside, though, it's a different story because the X-H2's much higher resolution sensor results in a few key differences 'downstream'.
Which is the flagship flagship? When we tested the X-H2S we concluded it was likely to come out on top because of its particular balance of resolution and speed… for the record, you can have 40fps at the camera's effective resolution of 26.16 megapixels with both JPEG and compressed RAW capture, and for decent burst lengths too. But if you really don't need all that speed, then maybe it's a different story, especially as the X-H2 is significantly cheaper too.
The X-H2 packs 40.2 megapixels, which is the highest resolution of any current APS-C format mirrorless camera. And it's really not all that slow - 15fps with its mechanical shutter and 13fps with its electronic shutter. It wasn't all that long ago that 15fps was considered pretty fast and the domain of only the top-end pro-level DSLRs (none of which had 40MP resolution on tap). Without doubt the X-H cameras now rule the X-mount roost rather than just being the side show that was the X-H1. Even with the arrival of the X-T5 - which shares the same sensor as the X-H2 - the X-T series is no longer the headline act. If you want the very best - in both photo and video - that Fujifilm can deliver in the X mount, you'll want either the X-H2 or the X-H2S.
The high-res sensor is designated X-Trans CMOS 5 HR as opposed to the X-Trans CMOS 5 HS imager that's at work in the X-H2S. It's a BSI-type design (but, notably, not stacked like the faster HS) and obviously has smaller pixels than the X-H2S's 26MP sensor, but Fujifilm says it has devised a new image-processing algorithm that enhances image resolution without compromising the signal-to-noise ratio. The sensor also has an improved pixel structure to enhance the light-collecting efficiency, enabling a new native base ISO of 125 (compared to ISO 160 for the X-H2S). The full native sensitivity range is equivalent to ISO 125 to 12,800 with extensions to ISO 64 and 51,200.
Incidentally, you can have up to 20fps shooting with the electronic shutter provided you're happy with a 1.29x crop. Of course, here it's not such a big sacrifice in terms of
