Ok, I have K2 and K1 European version. I have not coughed up the money to buy K3. I got the K2 from tt11 before they are no longer carrying it. I read the reviews on K2 and K1 European version on tt11 as well. Let us get something straight here. Both K2 and K1 European version are sticky. I don't understand all the reviews about them being tacky (like Tenergy, etc.) and not sticky (like chinese rubber DHS and friendship); maybe they got a bad batch? No, K2 and K1 European version are both sticky, like 729 and H3 but let also be honest, they are NOT and they never will probably be as sticky as 729 and H3.
But do you really want them to be as sticky as 729 and H3? If you do, just go get 729 battleship II and H3 neo ,and boost the heck out of them. In addition, both K2 and K1 European version have the catapult effects that ESN sponges give, without boosting. I have always boosted my H3 neo. I would not boost K2 and K1 European version because they are already pre-factory boosted. Again, do K2 and K1 European version have as much catapult effect as, say Tenergy 05 or Dignic 05? No, of course. But then why do you want them to have such big catapult effect anyway? I have tried Tenergy 05, 05fx and Tenergy 64. My short games and my serve, and my push all suffered because of the catapult effects.
In conclusion, I find K2 and K1 European version to be unique. they are actually very very good "hybrid" rubber. I am still going back and forth between K2 and K1 European version, and my H3 neo on my forehand. I love the catapult effects of the K series from Tibhar but I always find myself playing with H3 neo again because I love to have the option to do slow, high spinning loops alternating that with fast low arc forehand loop drive. There is a reason why H3 neo has such a strong following.
Please note, I am not even aware there is a K1 pro and K2 pro version. I have not coughed up the money to buy a K3 yet either. But seriously, I think people are splitting hair here. I have K2 and K1 european version on the same blade (Tibhar Stratus Powerwood). They are pretty similar. At some points, we just have to admit: it is not the rubber, it is our techniques. Spending more money on more rubbers ain't gonna help our game. Stick with a rubber for a while and see how you like it and adapt to it.
I can see people arguing about using say H3 neo v.s. K1/K2/K3 v.s. Tenergy 05/Dignic 05 on the forehand side. But when you are trying to split hair between K1 v.s. K2 v.s. K3, you are still falling into the marketing trap and wasting money and time thinking about it.