>>718229721
There are 26 bosses in DS1, only 4 of them are duded in armor - Artorias, Iron Golem, Ornstein & Smough and arguably Gwyn. So 15%.
And there are 41 bosses in DS2 and 12 are dudes in armor - Burnt Ivory King, Sir Alonne, Fume Knight, Graverobbers, Throne Watchers, Dragonrider, Twin Dragonrider, Velstadt, Dragonslayer, Ruin Sentinel, Looking Glass Knight and Pursuer. So 29%. Triple the amount of individual bosses and twice the amount when compared to the full boss count.

If you don't count repeating bosses (so basically just Asylum Demon copies and Twin Dragon rider) and DLC bosses (the most optimal situation for DS2)
Then it's 3 out of 20 - 15% for DS1 and 7 out of 30 - 23% for DS2.
Not to mention a lot more basic enemies becoming dudes in armor in DS2 as well.
It mostly got really bad with the DLCs but overall there were still way more "dudes in armor" than DS1, no matter how you look at it.