I get 5-6 hours of battery life with real usage, close to 10 hours in "green" mode, I've got a 15.6" screen, a keypad, 16Gb of RAM, an i7 processor, and a 1Tb SSD. And it's just over 4 pounds and pretty thin. I have NVIDIA graphics. The Tecra Z has an available 3K touch display, and its HDMI port can power a 4K monitor at 60Hz (even while its internal monitor is still going, and its USB3 port is powering a third monitor; that's my office development setup).
I've had it over a year and a half already, and it's still going strong.