I have had a variety of Lee Enfield rifles, to include a nice Lithgow MKIII I should have kept. I agree, the MKIII variant has superior handling qualities by far. The MK IV has some admirable attributes, but it handles like a plank compared to the older rifle.
My sole Lee Enfield right now is a 1917 MK III* manufactured at the Enfield armory. A perfect bore, and it is a keeper.
"A Liberal is someone who doesn't care what you do, as long as it's mandatory". - Charles Krauthammer