Not really. The supertele lenses are really optimized for sharpness. Lens design is all about tradeoffs. One lens known for particularly good bokeh (often described as 'creamy') is the 50mm f/1.2L. That lens is optimized for bokeh, and the way that's done is to undercorrect for speherical aberration in the lens design. When you do that, you get better bokeh, at the cost of a loss of some sharpness (and some focus shift, too).
without going into lens technicals I don't entirely understand I DO agree with this point.
I normally like very sharp lenses with very little CA. That tends to require special types of elements and aspherical correction elements in the lens. This often results in lenses with poorer bokeh, tho they may have really nice flat field performance, great sharpness and low CA.
I will often choose a lens that has no aspherical elements in it when I want one that will give me smoother, more pleasing looking bokeh for a shot. For the most part, this works. Old primes, if you can live with whatever their shortcomings may be, are sometimes good for this. These lenses will often have a lot of CA and coma though, which can either add or subtract from the overall image effect.
OTOH, there are many cheap modern consumer zooms and many perform better than some old primes and are far more plentiful and compatible with modern cameras. I've got some used ones for as little as $100 that perform beautifully; acceptable sharpness of focussed subject and creamy smooth bokeh. (nikon 55-200mm VR comes to mind) You can buy a lot of them to experiment with for the price of a used 50/1.2 L !
More complex modern zooms can be hit-and-miss. Even within the same lens!
My 70-200 f/2.8 L IS II for example. I haven't cataloged where it occurs but I know it does. At certain focal lengths and apertures the bokeh on this lens is horrible! But that only occurs in some situations over a very finite set of settings. It actually provides reasonably decent bokeh most of the time.
And of course, the bigger the sensor, the more ability you have to generate out of focus areas and bokeh.
Tilt-shift lenses can be put to work too if you have the budget for them.