I still think the Knight wins Mid/High Diff
Sans has demonstrated at least 21 dodges, and the Knight's attacks would tire him out quickly in just a few turns
Furthermore, it must be taken into account that the Knight can manipulate his perception, possibly give him a migraine, push him with a very strong wind, use telekinesis to move his body
I can see how the two of them would teleport away every chance they got, and Sans has it harder with the homing attacks and the
Star Tractor attack
And that's without even mentioning what would happen if the Knight summoned the Titan