I've just been watching a life stream of the Jake/Sherry single player and really liked it, pretty good ending, nothing really surprising to be honest, scroll down a little.
** SPOILER** (highlight to view)
Jake and Sherry both escape the final fight with Ustanak and after the credits roll you see Sherry on a plane typing her report, she opens her phone and receives a message from Jake declaring he's dropped his price to £50, and it cuts away to Jake on the ground on a motorbike who rides off after looking up at the plane flying overhead.
** SPOILER** (highlight to view)
Jake and Sherry both escape the final fight with Ustanak and after the credits roll you see Sherry on a plane typing her report, she opens her phone and receives a message from Jake declaring he's dropped his price to £50, and it cuts away to Jake on the ground on a motorbike who rides off after looking up at the plane flying overhead.