Well, this is based on Wiki data:
Wingloading on max take-off weight: ME410: 63,5 lbs/sqft, P38L: 66 lbs/sqft, FW190A8: 54 lbs/sqft
Powerloading on max engine power on max take-off weight: ME410: 0,14 PS/lbs, P38L: 0,16 HP/lbs, FW190A8: 0,185 PS/lbs
This kind of numers a rather vaque, however, since the max weights do not list the loadout so they could be quite far from typical weights but should give a ballpark of the airframe performance (also listed the FW190 for shts 'n giggles).
-C+