Peter from the samples of the original post I take it that you may, above all, look for lenses that do "doughnut" shaped bubbles with a thinner outer ring as created by mirror tele lenses.
the Nikkor-S.C f1.4 5cm ( I downed clarity in LR a lot, otherwide the bubbles and their outer ring would have been quite a bit more pronounced, too harsh for my taste )

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andreas, on Flickr
Canon LTM f1.8/85 can do it ( though bokeh is smooth when stopped down )

Harley Davidson by
andreas, on Flickr
Takumar f1.4/50mm also "can" do it

Bamboo by
andreas, on Flickr
concerning Canon LTM, the f1.4 is more contrasty then f1.2 and f1.5, but neverthless the f1.4 imo seems to produce bokeh that isn't dissimilar to that produced by the f1.2

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andreas, on Flickr
my f1.5/50 has very low contrast, lovely, and, as imo all 50mm Canon LTMs, not bubbly:

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andreas, on Flickr
for a low contrast but smooth bokeh Olympus Olympus OM F.Zuiko Auto-T f2 85mm, that is the first version with single coating

offering incense during Vietnamese New Year by
andreas, on Flickr
though later MC version should be fine too, other smooth bokeh, rel. low contrast include Om Zuiko f2.8/100mm,Minolta MC Rokkor f2.5/100mm, Super Takumar f1.9/85mm...
very fun, individual bokeh, cat's eye and swirly, for rel. wide angle, Pen-F Zuiko f1.8/38

Happy Lunar New Year by
andreas, on Flickr
different but fun too, Canon LTM f1.8/35mm

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andreas, on Flickr
similar: MC Rokkor-PF f1.4 58mm

Untitled by
andreas, on Flickr