Not necessarily bad advise as much as just being aware of the upsides and downsides of such a move. Having a lense that can resolve 36mp on a full frame means it should be able to resolve an image for an APS-C of 24mp. The better Canon and Nikon lenses can resolve a 36mp image on a full frame and will be able to also resolve the 24mp for the APS-C. This just means if one wants to start with APS-C with full frame lenses and work up to a full frame, they must start out with the very best full frame lenses for proper resolution at the APS-C level.

Yes, a Sony 24-105mm f/4 G sounds nice -- except on the wallet. And now a 400mm f/2.8 prime that should appease the haters who say Sony doesn't offer enough lenses. I think these lenses pretty much fill any gaps in the native Sony e-mount lens lineup. Of course, Sigma and Samyang are pumping out FE lenses like clockwork, too.

The a7Rii is a fine camera, and until today's announcement I was torn between it (and an a6k body for sports) or the a-mount a99ii. I do mostly landscapes, astro, and candids, but I also take a fair amount of pics of my active kids. For me, the a7Riii seems to be the answer.

The bigger the sensor, the less the imaging problems. A 4/3rds lense can resolve 20 megapixels on a quarter of a full frame sensor. If that lense had an image circle that could cover a full frame sensor, it could resolve an 80 megapixel image! That is why most full frame lenses do poorly on small sensors like 4/3rds; a full frame lense cannot resolve the image sufficiently over the aperture range - even the Canon "L" series. This is why all but the best full frame Olympus lenses have one or two apertures at one or two focal points. Even the best full frame zooms show limitations above f16 and usually at both ends of the zoom. The primes suffer the least because of their simpler designs and therefore have wider aperture ranges. On your A6000 the lenses will do a little better than on a 4/3rds camera.

To use an Olympus full frame lense on one of the new Olympus digitals will require an MF-1 adapter. You will only be able to shoot in manual and aperture modes. Since the full frame Olympus lenses were not designed for the resolution required for the smaller sensors, almost all of their cheaper full frame lenses have very limited use. But there are some of their better lenses that work fantastic. I use my 90mm macro (180mm, f2, lifesize equivalent) and love using it. To get a better idea of what would work and how well it will work, go to the Olympusamerica.com, cameras, accessories, lense accessories, and click on the MF-1. At the bottom there are six info bullets. On the last bullet, click on the "Click HERE". This will provide you information on using the full frame lenses on a 4/3rds digital.