Where are you getting your information?
Nothing about this tank is impressive. You busted up the xk-2 for some odd reason, but here you are praising the Admin: Text deleted. Language please. There are better ways to make comment and not breach forum rules on respect etc... This comment was unnecessary.
My information is based on many years of research and actually serving on tanks and in other positions that would allow my mind to focus and wander around and look at different countries capabilities in the armor field, some of those countries I have visited first hand. This doesn`t mean that I walk around thinking that I know everything, and I am not afraid to admit it when I am wrong so if you have something that you would like to offer instead of making a wrongful accusation against me and Swerve then I am willing to read what you write.
Okay - Countries that have researched and or developed a 140mm maingun would include the following:
Germany
UK
France
U.S
Israel
ROK
Japan
Ukraine
There could be others that I am not fully aware of, reasoning behind research and developing would be because of the following reasons:
Advancements in armor materials
ETC programs have not matured fully, at least with some countries, and the cost factor.
Engagement time sequences when engaging threat vehicles, engaging a tank 20 years ago at 2,000 meters is alot different today due to FCS advancements, propulsion systems, suspension and armor protection levels, so the ultimate goal is to engage at maximum effective maingun range with a high probability of a 1st shot kill before your opponent can close the gap to do all kinds of mean nasty things to you. Please keep in mind that we are talking future threats, not present, so look for breech and recoil mechanism being able to have the ability to offer either a 120mm or 140mm.
Russia and China are also working on larger maingun calibers, so this could be a factor also.
As far as armor protection capabilities look up Kyoto Ceramic technologies, the side modular armor does look like the concept that is used on a Leclerc, but I would also agree with Waylander that the front turret armor looks alot like a Leo2A5/6 or even a little like a Canadian Leo1 with their latest armor package.
If there is something a little more specific that I can answer or if their is something that you disagree with I am more than willing to give you the courtesy and listen.
PS - the only part of Korea that I have a dislike for would be North Korea, and that is totally for their government, not the people.