It depends what you mean by "catch up"
Are you going to be level 45 and blitzing round Bichon Castle getting 100k exp a kill straight away probably not, will you enjoy coming back to Mir and having some fun leveling and trying out the changes improvements? Most defiantly! IMO Taoist has had some major improvements in this version allowing them to compete in terms of being able to mass kill, Wizards are their usual glass cannon selves, Warriors again function amazingly well as a meat shield, Assassins feel a little out of place compared to Mir 2 but use observer mode and watch some of the other players and see what you think!
Biggest benefit of starting a little later is your starting quests, areas etc will not be as contested. Items are now readily available in the trade merchant and spell books are abundant.
If you need any help in game drop me a message.