Never used P&T on PvP but sounds interesting. It fires quick and stable, has a magazine of 6, has tons of AA and of course being invisible (the glint gives you away anyways tho, it's more a PvE perk I think).Not many players have SoV and EoS yet perhaps. Players who roll with IB seem to know what they're doing, its probably not a newbie choice.
Praedyth is deadly and used it a lot when i was into sniping as well. Its ROF also makes a double body shot easy enough. But I think Patience and Time is the most dominant Sniper Rifle in the game, though a bit underused nowadays. With LDR and Longbow not far behind.
Just don't know If those sights will work for me. It's like Ice Breaker. I love the concept of always having ammo. But crap I can't use those sights effectively at all in PvP. It's something about the zoom and the pan speed while aiming I don't know.