Who is using the Olymppus 75/1.8 as their telephoto?

Have never been much of a telephoto guy so for a tele I've been using the Canon 55-250 on that system (it's passable, just OK) and the Panasonic 45-150 OIS on my m4/3's system.

Yesterday went to a vehicle race and decided to bring the EM-10 and 45-150 instead of the Canon system and it failed miserably!  Did not get a single usable picture from the day - mostly because of the lack of subject separation (I knew this going in, can't expect that from f/5.6, backgrounds were just messier than I figured they'd be at the race site) but also there were more mis-focused shots than you would expect.  Much more.  Forget about focusing (using AF-S, not trying for continuous) on anything moving and many times it wouldn't lock focus and just hunted back and forth before giving a false lock, including stationary vehicles that were staging!  FWIW, I do not have any focus issues with any of my other m4/3 lenses - I'm sure this is just the price to pay for an inexpensive tele.

So my question is who is using the Olympus 75/1.8 as a tele?  I like the 1.8 aperture as it will give fast shutter speeds and as good of subject isolation as is possible.  How fast is the focus for moving subjects?  Is there still talk about another longer telephoto coming out like a 150/4.0 or something if I want to go even longer?  I've thought about the Olympus 40-150 but it's more than I want to spend ($1699.- + 13% tax here in the Great White North, about $1900.- when all is said and done) and I am also NOT liking what I've seen from it's bokeh in some situations.  Alternatively, I could just bite the bullet and use my Canon system for telephoto and get the 70-200IS that is on sale right now for close to the Olympus 75 price.  That would be much more versatile and I really like how responsive that body is but I am phasing out how much I use the Canon system and have been thinking of putting it all up for sale, this would keep me in the system and I'm very 'meh' about having both.  The 1.8 of the Oly would make it useable indoors, where I know the Canon would be limited for moving objects.  Decisions, decisions.

Comments, ideas?  Thanks all!

i have the 75 with the Oly 40-150 (slow one) and Panny 45-200. I don't bother to take the 2 zooms along anymore. The 75 is so sharp you can do a fair amount of cropping and still get better IQ than the zooms.

If I need a longer FL I just resign myself to the fact that I took the wrong camera outfit with me. I have Canon FF and APSC and the tele zoom options are just much better. I do have the 55-250 IS STM and find it to be a great lens. I'm not sure which version you have, but I use mine even more than my 70-200L zoom. Maybe you want to try the STM version or another copy of that lens because it is the best bargain tele I have ever seen. Way better than any of the m43 consumer zooms

primes are good at the shorter end when you can crop down.. much more difficult at the tele end and 150mm eFOV is a very specific FL that is restrictive in terms of compositional opportunities

i like the lens per se but the 40-150/2.8 is overwhelmingly more useful ... way more reach - but more importantly with the ability to dial it back to 40mm if needed

i also had the 70-300 which gives good reach for size and weight but not great for things like sports due to the slow apertures...which is critical at longer FL for stability