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Fuji has published an overview of lenses which in their view are optimized for the new 40MP sensor. In my opinion people are reading way too much in that list. Two examples: the relatively new 16-80/f4 is not on that list, while at the same time it is the preferred kit lens with the X-T5. Second example: the 10-24/f4 WR isn't on that list either, while the 23/f2 is. Now the latter has known issues with corner/edge sharpness esp. at f2 and when close focusing. When you look at the data that e.g. Fototest.de publishes about these lenses, you see that the 10-24/f4 WR is way sharper than the relatively 'soft' 23/f2. My conclusion is that the list was composed for marketing purposes and that you can safely use the lenses you mention on the 40MP sensor and still be able to 'see' the increase in resolution. It will be different for every lens, but the difference between e.g., the 35/f2 and the 23/f2 (both on the list) is just as significant as the difference between the 16-55/f2.8 (on the list) and the 16-80/f4 (not on the list). Just a reminder re. resolution. When you print your images 20x30cm, you most likely won't see any difference between the 26MP and 40MP sensor. The difference will appear as from approx. 45x70cm prints and larger (at 300dpi). The two main purposes of higher resolution cameras are (a) print bigger and (b) crop heavier. True, many users look at their screens and zoom it at 100 or 200% and 'see' the difference, but that's not how you look at images. So, unless you print big or crop heavy, 40MP are not a 'must have' and the differences between the different XF-lenses will remain unnoticed. In fact, it's also good to bear in mind that 40MP come at a cost. I did some tests with a X-H2 on loan compared to an X-T3 that we still have, and it showed that at ISO3200 and above the 40MP sensor is substantially noisier than the 26MP sensor. That might be also something to consider before jumping on the 40MP bandwagon.