My one tip would be to add some automation on that pad. Maybe some filter automation to let the pad flow and ebb with the drums if you know what I mean. I think it just use a little more work to really set it apart. Overall though, I'm really feelin this.
I really liked this- my only recommendation is that with the portamento pad, it seems to be poling up in that 200-300 hz range...i'd recommending taming that with a highpass or at least panning it away from the bass to let the mix breathe. alternately, consider putting copies on left and right and pitch shifting one of them by about 3 cents