1) I may never be happier than I am today.
2) I may never be as happy as I am today.
Do these imply than I haven't been happier than/as happy as I am today in the past?
3) I may never play better than I played in yesterday's concert.
4) I may never play as well as I played in yesterday's concert.
Do these imply that I haven't played better than/as well as I played yesterday any time before yesterday?