Avenger20

Difficult indeed. I like the 5D3 very much. Feels like a real professional workhorse. But will likely be the worst in low-light and have the worst fps and (raw) buffer. But has the best AF system ...

You can just convert the RAW files to DNG with free Adobe DNG converter. Then you can load them into the old Lightroom version. That's what I do for the M50.

These Tamron Gen 1 lenses did give me problems before (80D), so no surprise they are doing it again. You will have to send them in for a firmware upgrade when it comes available.

Kind of depends what you are looking for. The 6DII will be better in low light and get you a more shallow DOF with the same lens. The 90D will have better controls (joystick), more fps & 4k video.

This indeed being the number one advantage. You just can't risk it for a wedding. You can have the 90D as backup or for the second shooter but not for the primary shooter.

If Canon doesn't have a new grip, the electrical contacts for the joystick are likely not there so a third party also can't make a grip with it.

Isn't the problem the lens used? The Canon EF-S 18-135mm STM isn't even sharp on a 18MP sensor. Would like to see some examples on a better lens before I blame the new sensor.

Sounds like they did the same thing as with 1080p. Was also upscaled from lower resolution to soft 1080p. Guess we now will have soft 4k.

I have the 100D here :) Was already released in 2013 in Europe.

Yeah indeed, it's the megapixel race all over again. Yet my old 10MP 1D III gives me better pictures than my 20MP 70D with quality lens. Can't even see a significant sharpness difference at 100%...