Depending on the realism you’re looking for. If you’re looking for period accuracy (to a point), then yes, KC:D is still the closest. But if you’re looking for realistic combat, it is far from it.
Personally, I find that the combat realism in KC:D is on a similar level to Mount and Blade: Warband, in that there is just some of it. But in comparison, the mechanics of M&B is much more fun to play, while still relying on a level directional realism.
KC:D is just clunky. It’s not like I did not get far into the game enough to be good either. I was 50 hours in before I called it quits and genuinely gave it a chance. I still enjoyed the period world and graphics. I just wished the gameplay itself wasn’t so lackluster.