yes, 700 bdl's have sights (at least all my 700 bdl's did - i yanked 'em when i scoped the rifles).
the bdl's also have a 'shiny' finish on the stock in addition to what has already been posted. the bdl is also available (currently) in more calibers than the adl. bolt handle is checkered, too.
basically, though, it boils down to cosmetics. should you decide to get a bdl, i'd advise to get the hinged floorplate models.
many people actually prefer the adl and not because of its lower price tag.