check out some video. it seems phev performs fine.
https://www.youtube.com/watch?v=XF1U5pDVpzo
https://www.youtube.com/watch?v=d1WO9x_laiU
https://www.youtube.com/watch?v=WSho8T_Sxlg
according to What Car Group test - BMW X3 vs Audi Q5 vs Mitsubishi Outlander PHEV vs Volvo XC60 the 50-70 time of the PHEV is 5.4 sec. which is better than the Q5 and XC60.
For more details: http://www.whatcar.com/car-news/bmw/x3/bmw-x3-vs-audi-q5-vs-mitsubishi-outlander-vs-volvo-xc60/1322319