They are also not as low power as L4.. They are saying 60uA/MHz vs 36uA/MHz for L4
If we compare current w/o the switcher ("LDO current"),
STM32L4R5 (up to 120 MHz) 110 uA/MHz
STM32L4 (up to 80 MHz) 100 uA/MHz
STM32L5 (up to 110 MHz?) 96 uA/MHz
I notice they give the "with SMPS" number using a 3V supply for STM32L5 whereas for the older chips it was specified at 3.3V. No idea why they would change that. In any case, I think it's a wash. I don't see that the new core is going to do anything for me; I'd be more interested in the new or updated peripheral set, but I'm guessing it's pretty much the same too.