To answer your questions, over Thanksgiving I took some family group photos using the Tamron lens. A few days later I sold the Tamron so I don't have it anymore and couldn't compare at the same time to the Sony lens. The next day I purchased the Sony lens. About a week later I took a picture with the Sony lens using the same settings as the picture with Tamron. The time of the day was similar for both shots but not exactly the same. The distance from the camera to the subject was exactly the same. Both pictures were taken with the same AF, shutter released remotely with my phone.
It's not a scientific test just a general comparison.

I'm using an entry level camera, Sony a6000 with APS-C sensor.
A year ago I bought a Tamron 18-200mm lens for APSC cameras. I really liked the Zoom capability but I couldn't take a sharp picture to save my life, even when using a tripod. So, last week I bought a Sony Zeiss 24-70mm full frame lens. What a difference! I can't believe that pictures can be so sharp.
The below picture shows side by side comparison of the same spot, the Aperture, ISO and shutter speed are the same and the distance from the camera to the subject is almost identical.

Thank you all for your insightful replies. Many of you have asked for an update so here is what I have done so far.
First I explored all of the menu options to see if I had enabled, (or disabled), something that affects the shield that protects the sensor when changing a lens. Could not find anything wrong there. Since I am using third party battery grips and I did not have the problem before using them I was pretty sure that was where the problem was. I removed the grip from the camera and went to using the camera without the grip. The problem went away so I am assuming that was the cause. I have used third party camera grips on all of my Nikon cameras and never had a problem until now. They worked flawlessly on my Z6's but I sold those cameras with the grips included. When third party grips became available for the Z8's I bought them. The do operate properly when attached to the Z8's and they do not seem to affect any other camera function other than the one I asked about in this thread. I am currently contacting the manufacturer to see if they have received any other complaints about this situation. Perhaps there may be a firmware update or something of that nature. (Firmware for the grip, not the camera). The camera is usable with the grip attached if you are willing to put up with it shuttting down every so often. For those of you who may be considering buying a battery grip for your camera the manufacturer is MCOPLUS and it does come with a one year warranty.