Don't know much about past models of the Legacy, but I just took a good look at a brand new diesel 4x4 Legacy at a dealer over the holiday weekend. It had the loader, 3PT hitch, weight box, and 540 rear PTO. Looked real sturdy, well made, and had a price tag of around $14500.
I would say other than no ROPS this tractor is essentially more subcompact utility tractor than L&G tractor. And as an owner of both a Deere 455 L&G tractor (with 540 PTO and 3PT but no loader) and a 2520 compact tractor here is what I see as the two big differences. The Legacy has a joystick loader control which is indepenent from the 3PT lift control. The Deere 4x5's and I suspect the newest X700's do NOT have independent control. If I put a loader on my 455, I cannot use the 3PT at the same time as the loader. I have to install a lockout valve to switch between the two. Also the Simplicity salesman said you can put a backhoe on the Legacy. Not so for the 4X5's or X700's.
If I was to compare the Legacy to Deere models, I would say apples to apples is to the 2210 or current the 2305.