Ive owned several Range Rover Classics, and my little sis has owned several Jeeps..including a 13 jeep wrangler 4 door with all the whistles and bells...I would take a range rover/land rover disco any day of the week!
Keep in mind, the current model Grand Cherokee shares a platform and a fair amount of internal bits with the Mercedes ML (a carryover from the ill-fated Daimler merger). I think the GC makes a great sleeper luxury vehicle (if appropriately equipped) that doesn't maybe necessarily conjure up the same reaction that a Land Rover might.