In evaluating Subban's worth, much has been made of the contracts signed by Tyler Myers, and MDZ. Myers will undoubtably be a touchstone for Don Meeghan, MDZ for Marc Bergevin. Here's a more apt comparable:
PK COMPARABLE
The Cap's John Carlson is very good. Big, tough, very high offensive upside. Like PK, his potential is only partially realized but his ceiling is very high. Their offensive stats to date are very similar.
Here's what Carlson is being paid:
"...One day before the current CBA expires, the Caps finally handed their 22-year-old restricted free agent his new contract: six years, $23.8 million."
LINK
It bears repeating that this contract predated the new CBA. Consequently, I believe it should represent a fair high water mark for PK's new deal.