If the XIV was not in the same family as some of the friendliest-handling aircraft in the game, its handling quirks would not get the air-time they do and it would be considered a stone-cold killer.
It is possible for the SpitXIV to win a "duel", but yes, the SpitXVI is substantially the better close-in dogfighter at low alts. As it is compared to a P-51, Fw-190 D9., Bf-109K4, Typhoon, etc. However, the SpitXIV, like those other planes, doesn't really HAVE to engage the SpitXVI if it keeps its speed and SA up. The SpitXVI out-runs or keeps pace with quite a few planes it grossly-out turns, out-climsbs, and out-accelerates, this is true, however I daresay this would be even more true of the XIV.