A small lens is going to eat up your lumens, so making it pocketable kind of limits you. I’m not a fan of the small cheapies, and you aren’t going to find a 2k-lumen zoomie like you are wanting. The better zooming lights are a bit bigger:
Jax Z1 - Review: JAX Z1 (1x XM-L2, 1 or 2 x 26650/18650)
UniqueFire 1504/1405 type - Uniquefire UF-1405 - A worthy zoomy?
The UniqueFire 1505 may be closer to what you are looking for:
http://www.gearbest.com/led-flashlights/pp_186047.html
Info here: Review: Uniquefire UF-1505 (C8 style) and UF-1503 aspheric lens lights