This newly-introduced beauty weighs 65 tons, sports a 1500-hp engine, possesses more advanced armor than any other MBT currently in use, and its 120mm gun can fire high-tech, high-power munitions including new 2-piece high-penetration projectiles and guided shells. The Merkava Mk.4 also features an improved thermal-imaging system, a rear-end camera, a computer guidance system, and an internally operated 60mm mortar system developed by Soltam Ltd. The mortar can fire explosive and illumination rounds to a range of 2,700m. More info here: http://www.defense-update.com/directory/merkava4.htm
All things considered, it is probably one of the best tanks in the world right now...