Yes please! Especially if it can incorporate tasks as well! I'm migrating away from google as much as I can. Using Soverin.net now as server for email, calendar and tasks. On my desktop/laptop I use Thunderbird as the client, but on mobile it's still a lot more complicated (calendar app, thunderbird mobile, tasks.org, davx5; quite complicated)
The lack of calendar on mobile is the only reason I'm still using Outlook on my phone. I'm limited on client choice do to my job. So I'm left with Gmail, Outlook, or Thunderbird. But I need calendar support on mobile as my daily calendar changes by the hour.