WiFi won't perform. You said PTZ which implies a hardwired camera. If you can get power to a camera for WiFi you can get a network cable there. Alternately, any camera can be made "wireless" by using a dedicated RF link system like a Ubiquity Nano Loco. I use that to link the cameras in my sheds to the house.
I don't know of any camera, bullet or turret that is actually a true zoom lens camera. Don't confuse "zoom" with varifocal. A varifocal is a camera with a motorized lens, zoom lens, but it is designed to be set at a specific zoom level, that suits the installation, and left that way. The drive for the lens is not built for constant use. If that will work, look at the Dahhua 2231T-ZS. Excellent performance for about $125 on Amazon. There is also a bullet version
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I just got one today and it is set up for testing/burn in right now. It's replacing an SV3C as a matter of fact.
2231T-ZS, temporary mount about six feet lower and six feet to the left of the SC3V and with its' IR shut off -
SC3V, a 2Mp also -
There is an IR illuminator located directly in front of, and six feet lower than,the SC3V. It's a 30 watt one to "flood" the rear yard and keep the bugs aways from the cameras. I'm using extra IR illuminators to extend the night vision of most of my cameras. These screen caps are from BI which means the 2231T-ZS is a substream at 720P versus the SV3C, which isn't capable of a substream and a main stream, at the full 2Mp.
This one is from a B5442E-ZE, bullet form factor, 4Mp. Again a 720P substream -
In any event, you are looking for something I haven't seen and seem to be chasing megapixels. The problem with more than 4Mp cameras is that the amount of light per pixel is cut, proportionally, by the increase in pixel density. 4Mp, at the moment, is the sweet spot unless you're ready to spend about $2K for a camera and lens plus another $1K, or so, of the proper enclosure and that is a fixed focal length camera.