you can optimize a high polygon model down into a low poly one. this is how models are done for modern games. a high polygon model is an absolute must as they are used to bake normal maps which contribute greatly to how light interacts with it.
that comment about "real artists" is totally wrong. without the guy making high polygon stuff, none of the rivets and details of the a10 would show up in normal map. you'll have a perfectly flat plane like in lock on.
besides, in those comparisons you provided, the canopy of the hawk model looks so much better than the lock on version. explain how textures will help if they made the canopy all flat and boxy when it should be round and smooth?
also: nice textures, but poor model. this is what happens:
http://i224.photobucket.com/albums/dd251/biggunner1945/2009-4-10_13-34-47-86.jpg