"Its an early war aircraft for one, the bulgarians actually loved the firepower of the 20mm hub cannon, interesting to note one of the chief test pilots for the D.520 for the Germans made the same exact note - except it was completely ignored. Always wondered what happened if Mauser would of duplicated or replicated the Hispano gun."
109s had hub cannon later on and its value was recognized as such. Germans didn't need to copy Hispano as they already had as good, or better, weapon coming, that is MG151/20, and later on MK103 and MK108. It is these cartoon games that makes you notice differences between them that did not exist in reality.
-C+