Will the upcoming Oly 40-150mm f/2.8 be inferior in shallow DoF compared to the 75mm f/1.8?

The prime has bigger Aperture so I was wondering if I should just buy this now and save a bit more money. Of course the 40-150 has better focal length legroom but if we talk strictly bokeh effects/shallow DoF/background blur, will the bigger aperture prime still be a better glass for this case?

Thank you for the thoughts and opinions.

Keith

Edit: I'm using the E-M1 body.

 

Thank you for the quick reply, Barry. So basically if I step back to maintain equal framing and use the 150mm at its longest, I might get better shallow depth of field than the prime (newbie lesson for me). That's good to know since having flexibility in focal length might after all make the newer Pro lens a glass to strongly consider for a bokeh whore noob like me   . Thanks again.

 

= 300mm f/5.6 for FF systems. Will jot down those figures, thanks. Yeah I like dofmaster calculator but was curious more insight from the photo community.

Thanks, Lowrider.


Edit: Klorenzo thank you for the awesome link.

 

I updated your choices and narrowed the lenses down to two.

http://howmuchblur.com/#compare-2x-75mm-f1.8-and-2x-150mm-f2.8-on-a-0.9m-wide-subject

So basically, if the subject to background distance is 10 meters, they both have roughly/approximately (of course barring the quality of each lens) the same amount of background blur?

 

Wow, totally appreciate the info and the link.  

 

Thanks. But of course people looking to buy these lenses already know the long focal length restrictions.