The He-219 was indeed on a par with the Mosquito in many respects. However, by the time it entered service, it was too late to make a real difference, plus the Germans were running out of resources to build in greater numbers. As the Allies drove across Western Europe then the Germans lost advance warning and had a much reduced airspace in which to deploy their aircraft. Add to that the reduced range to allow Allied fighters to rove over Germany in daylight then pilot numbers became a major problem for Germany also. Bomber Command losses fell during the last quarter of '44 and into '45 for these reasons and had the UHU been in service much earlier, then it may have had an effect, but as it was it was all too little too late.