I got curious, and probably made a mistake. There is a birding store, Front Range Birding, a few miles away that is awesome help, and has a view of Denver's hogback. I had talked about looking into the 77mm Opticron body as the 60mm probably costs some dusk viewing time.
They also happen to carry Kowa, so the wonderful folks set them up for me.
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I will say that the Opticron in 77mm with the sld eyepiece lost by about 10min at what I think is 1.5miles. I could still see deer, but lost antler detail. Until that point, I favored it over the Kowa.
The 773 with te11wz eyepiece wasn't really impressive and I was thinking about all you suckers, and then all of a sudden the Kowa view was the same as it had been and the Opticron faded fast.
Unfortunately my above examples don't really exhibit that. The good picture is through the Opticron when I thought it was unusable. It was taken with a phone skope adapter. The bad picture is through the Kowa free hand and a few minutes later. They do highlight just how minisculely close good optics are to excellent optics though.
Now I am in negotiations with @kickinndishn about if we are able to rent our demon spawn out to expecting first time parents as a test run for a fair fee in order to fund this.