In combat (not in charts) 109F is beaten by spit in every single cathegory at any altitude. U may be marginaly faster than Spit, but not enough to do enough room to plan an effective ofensive move. If you go up, Spit will outzoom you, if you go down spit will outdive u, and will be far more controlable than your 109F at hi speeds. It also outrolls and outturns you, and is able to retain the E better while hard maneouvering. So, dont expect to defeat the spit based on the performance of the 109F. U will be able to outfly the enemy pilot, but not the enemy plane, so better improve your SA to know with enough anticipation whether or not you are in advantage possition to start an attack, or perhaps u need to bug out inmediately.