With quicker Entente or Central Powers victory or even WWI never happens itself, which of these empires will survive up to present day?:
Alright, Let me think here.
You need reforms for Austria-Hungary to survive. The only person that had the will and the power to go through with those reforms was the guy who got shot, starting the war. So WW1 would need to be delayed or not happen.
Once again, reform is needed. Preventing Russia from going communist is surprisingly easy, but keeping the Czar in power is much harder. If Russia keeps the monarchy intact, expect the Czar to have much less power.
Week, but surprisingly stable. Might recover some of its past strength after oil is discovered in its land, but it will never regain the balkans.
Maybe, the British economy was designed to keep the Home Islands strong, and the colonies week. Almost all of its industry was in the Home Islands, so it can't fight a modern war with someone capable of reaching that industry and survive completely intact. Keeping control over India will ether become impossible, or become one of the most repressive parts of the empire. Also, without WW1, conflict with the rising U.S.A. is still possible.
WW1 was Frances last war as a true great power, and France never really recovered from it. The French Empire controlled several places that were originally independent nations, Vietnam in indochina for instance. Several of these peoples would remember their independence, and would want it back. So I don't think they can keep much south of the sahara.
Easily. If Germany wins WW1 or if WW1 doesn't happen, the German monarchy will stay in power. The german colonial empire was sparsely populated, and their weren't that many pre-existing states in those areas, so they will be able to keep those for as long as they are willing to defend them.
Well, keeping the Italian monarchy is easy. Their Colonial empire? Well, that wasn't very big, so theoretically it should be easy for them to control. Unfortunately, Italy had a tendency to invade Ethiopia, which wasn't good for them at all. If the don't have any misadventures in Ethiopia, I could picture them keeping most of their empire.