Parisian is lighter than dark brown. You can see Parisian Misty Calf on the Lobb site: http://www.johnlobb.com/us/becketts-1In museum, I find the lighter Parisian brings out the antiquing/mottling more.
Anyone interested in these BNIB with trees Keeble loafers, please let me know. Great looking unlined loafer in 9/9.5 D. Because they're unlined they don't seem as narrow as a typical EG D width. PM me if interested.
I think you're right to focus on fit. There's not point in buying a really nice shoe that you end up not wearing b/c they don't fit. I've done that and slowly have unloaded a bunch of shoes over the last year, really, really nice pairs too.
All else being equal, I love the Lobb Beckett. Just a beautiful shoe. I have them in green misty.