Not really, other than what you have already mentioned, the "hammerless" design. Also the PD version is darker than yours. If you're worried about the hammer you can always just have it bobbed off, or get a replacement hammer that is bobbed and just switch it out. That way if you ever change your mind you can just swap it back.
You'll lose money when you either trade up and pay the difference or, sell it outright and then use the money to buy the PD version. Unless you really need the darker finish, I would just keep what you already have, and maybe bob the hammer.
And if you like the front sight of the PD version better you can always just buy the sight and swap it out as well. You can maybe do that yourself or pay a gunsmith, it's just a pin that is punched out/in.