but is it actually available, as in you can walk into store and buy it available?
While the EF 40mm STM is a decent lens, it is hardly comparable to the RF lens. The RF 24mm is f/1.8 versus f/2.8, is stabilized, and also focuses far closer for pseudo macro use. Fast, sharp, stabilized, and macro capability is a combination that can't be matched with any single EF-M lens.
35mm f/1.8,
We're talking 56mm f/2.8 equivalent here. The RF nifty fifty on the RP will do a better job at less than half the price.
The nifty fifty is not stabilized, nowhere near as sharp wide open, nor can it focus as close. The R10 is also all-around more capable than the RP. If you want to shoot anyt video, the R10 + RF 35mm is far better than the RP + RF 50mm
50mm f/1.8,
Get a used EF 85mm f/1.8 USM, slap it on the RP via the adapter, stop it down at f/2.8 and it will outperform this RF lens.
Neither of these would be my first choice as they both have issues. The RF 50mm is not sharp wide open, but the 85mm has massive amounts of fringing. The 85mm on the adapter is about 4 times the weight of the 50mm.
and 100-400mm f/5.6-8. The gaping hole in the crop RF lineup is any sort of wide angle zoom. Canon will surely launch a crop wide angle zoom for RF, but is anyone's guess as to when.
Canon EF-M and RF are not cross compatible in any way and it is impossible to adapt lenses from one to the other. By all indications, Canon is phasing out the EF-M mount and consolidating crop and full frame under the RF mount. Any future crop RF lenses beyond the two standard zooms are a complete unknown at this point. There will likely be more crop RF lenses but it is unknown what those lenses might be or when they would launch.
In general, it is a bit of a confusing time to buy into a Canon crop system. The EF-S crop DSLR lineup is clearly dead and many lenses are already discontinued. The EF-M system is a known entity, but all appearances suggest that it is also dead, just not quite as dead as the DSLRs. Crop RF definitely has a future, but the future lens lineup is a complete unknown and may never include a specific lens you might want.
I'll tell you this: if you want something like the Sigma 56mm f/1.4 you can wait forever. If you want the ef-m 32mm to be ported over to the RF mount there's a chance it will happen, however, you will have to pay a substantial RF tax.
What "RF tax"? The RF 18-150mm is the same price as the EF-M 18-150mm. Same for the RF 18-45mm and EF-M 15-45mm.
If 16mm is your focal length f/2.8 is all you got, no f/1.4 Sigma to give you those two stops extra.
At a significant size and weight penalty. The RF 16mm is pretty tiny and cheaper too.
22mm pancake? Not as compact in the bag due to the bigger mount, if it will ever happen anyway, as the 24mm acts as a step up to full frame.
A whole extra 8mm of diameter.
The RF 100-400mm will be okayish on the 24Mp R10, but if you want max pixels per duck - which is often the case at these focal lengths on a crop sensor - with the R7 diffraction will be a sharpness killer.
Diffraction doesn't matter. More megapixels is always better.
To me there are only two reasonable appealing combination of an RF-s camera + RF lens: - the R10 + RF 24-240mm IS USM. With 24Mp diffraction isn't a problem.
Diffraction is never a problem. The only people that should worry about diffraction are those doing focus stacking. For everyone else it is a red herring.
The lens focuses fast enough to make you benefit from the focusing capabilities of the R10.
- R7 + RF 100-500mm L. That lens will be able to satisfy that detail hungry sensor. No, it's not exactly affordable.
The main point is that crop RF is not nearly as lens deficient as some might claim. Some of these RF lenses might not be everyone's first choice, but they are still very viable options with many offering capabilities not possible with EF-M.