Some lenses are designed to let you change the mount. Zeiss CP lenses are set up to do that, and some high end Canon cinema lenses (North of $40K). I doubt if Sony lets you change to a EF mount.
If its a savings to you, you might get a different lens and sell the Sony.
http://blog.abelcine.com/2013/11/13/changing-zeiss-cp-2-lenses-from-ef-to-pl-mount/
There are pl to ef adapters for a limited number of lenses. Some buyers indicate that the adapter worked on their Sony pl mount lens, but I expect that not all will work.
This is from one of the comments on the B&H web site:
"It should work with any PL lens, but I can say from personal experience that it works with my RED 50-150 zoom, RED 300 prime, and Sony PL primes, Zeiss PL zooms, and many others.
- DOUGLAS J on Sep 7, 2015"
http://www.bhphotovideo.com/c/product/995147-REG/fotodiox_ar_pl_eos_p_pro_canon_eos_adapter.html