I'll answer your question, but in a way it will point out how badly the combat tree needs to be re-vamped IMVHO, and you probably will not like the answer.
As of right now, Combat has the least survivability out of the three trees. Deadened Nerves/new Cheat Death are both better than Reinforced Leather. Even Enveloping Shadows is better than Reinforced leather because of the increase time of Feint that it now has. Sub also has access to prep which gives you a second evasion, second vansih, second dismantle, and second smoke bomb. Combat no longer has two minute evasions, and they lost parry/riposte. They also lost Nerves of Steel. Assassination has deadened nerves which is a superior version of reinforced leather, and Master Poisoner also has reduced duration of poisons.
Combat's mobility I think is better than assassination because of Restless Blades reducing improved sprint below 60 seconds, but really poor shape compared to sub mobility. Combat does have blade twisting, but it is too unreliable, so you still have to use crippling on the off hand. Sub and assassination don't need to use crip in the off hand.
Combat's edge is revealing strike Kidney Shots, and Eviscerates. But Sub with master has better eviscerates, so the extending kidney shots is the only edge. Assassination has an easier time keeping up expose armor (all combo points refunded). So, even if you were to revealing strike expose armor, for combat it is not worth it.
Adrenaline Rush, Blade Furry, and Kspree help. But Blade furry in its current form isn't a good cool down to use on a single target anymore. :/ Kspree duration was increased because it lost the glyph, and only Restless Blades can possibly reduce it to the original glyph cool down timer. So the only cool down out of the three that improved was adrenaline rush, assuming you can stay on a target.
Improved gouge is nice, and very useful.
Improved Throwing specialization is mediocre given how many casts are instant now, and rogue throw, and deadly throw aren't. Bandit's Guile takes too long to build up stacks on a target so they fall off.
Without Restless Blades, combat PVP would be unplayable in my opinion.
Assassination damage is the best, while sub only has good damage out of stealth. But combat's damage can't compete with the other two trees. No armor pen talent, and no increased poison damage means combat doesn't hit hard enough. Its mastery Main Gauche requires you sit on a target for a long time to take advantage, and that you take combat potency to maximize its design.
Combat PVP, like its bro in PVE, is a mess, and it needs some love from the devs.