OOh nice. I bought it on steam for 20 a couple of months ago and I just started it 2 weeks ago. Really enjoying it a lot, way more than 1. The level design in this game is amazing, the clockwork mansion and the aramis stilton mansion really stand out. I'm on the last level right now, love it!
I was late getting around to playing this. Played it about 2 months ago. Straight up fucking amazing. The best non linear level design in a linear game ever. Such a fucking good game.
The first is great, but Dishonored 2 is better. I'm replaying D1 right now and it still holds up really well, so you can probably play them out of order (although you'll miss out on a bunch of plot/lore if you skip the first).
If you're willing to wait I'd say you should probably play the first + DLC before you play D2.