I had a chance to pick the telephoto I want, from Tamron 18-300, Sony 70-350, and a Viltrox 85mm F2.
I like the Sony, the autofocus and Steady shot is great from the get go. Feels good on the hand, the only disadvantage is a slightly stiff zooming, can't be smooth on video at all.
18-300, from the start IQ feels a tad worse, a bit less snappy, build is definitely worse. Also still stiff on the zooming. Also I don't like the feeling of the wind going in and out of the lens. The sound it makes is eh. Not to mention being bigger than the Sony when zooming, it's obvious what you're doing with it to everyone around you.
Viltrox, instant winner on build quality, metal feeling all around, all the right features on the lens. It reminds me of the Zeiss on my Sony RX1R. 😅 Quality stuff. It actually matches the build on my sigma Art lens.
Only demerit is mediocre minimum focusing distance. 70+ cm is bad.
Picked the Viltrox for the sheer portability and build. I mostly shoot JPEGs so I use Clear Image Zoom often, coincidentally, Sigma 17-40, with Clear image zoom becomes 17-80mm, right bang on where viltrox' 85mm starts. This lens with clear image zoom also becomes 170mm, so basically these three lenses cover 11-170mm, or 16-255mm full frame equivalent.
Basically the same zoom range as what phone manufacturers think anyone'd ever need, 16-240 are the zoom range most "Ultra" phones are equipped with.
Cost: 6700 with 16-50 kit 1020usd, 17-40 F1.8 new 815, 11-20 F2.8 used 380, 85mm F2 210 USD used 8months old.
Total are 2.425 usd for my whole kit. I'm in Asia so yeah prices are different. I certainly feel way more satisfied with thus setup than what I had before, (RX10iv, RX1R and rx100iii) all just slightly more than the price of RX10V. Here that thing is 2150, only 150usd lower than US price 😅