Greetings!
I went shopping last year for a new pair of 7x42 top-of-the-line binoculars, and considered the Zeiss FL, Ultravid, and Trinovid as the only real contenders. In fact, I considered the Trinovid only "for laughs" as a baseline comparison to the other two. The laughs took on a more serious tone after extensive comparisons, which were not at all what I was expecting.
Here's the essence of it:
Zeiss FL: The Zeiss FL is a magnificent binocular, but for my own purposes the build quality and certain aspects of the optical performance were just not what I was looking for. I was looking for a pair of full size 7x that would perform marvelously in all conditions, and travel the world with me. I felt like the FL was more of a state-of-the-art luxury birding close-to-home binocular as opposed to the voyager "tank" I was looking for.
Ultravid vs. Trinovid: The Ultravid is fantastic. Probably the brightest full size I have ever looked through, and better color rendition and contrast than even the FL. Slightly more CA than the FL, which is not surprising considering that the Zeiss FL was designed mainly for apochromatic purity. However, the Ultravid is quite magnificent in almost all other optical qualities, beating the FL on most counts. HOWEVER....
The Trinovid has better sharpness across the entire field of view. Many other posts on this forum by others have reinforced this opinion, as has my own testing with several different specimens of both binoculars. The Trinovid 7x42 (I won't comment on other configurations having focused my observations on the 7x42) is one of the sharpest binoculars edge-to-edge I have ever examined, beaten only by the Nikon HG 10x25 and equaled by the Nikon HG 8x32. Both Nikon models, on the otherhand, exhibit higher levels of CA than the Trinovid, and lack the overall color purity and brightness of the Trinovid and Ultravid. In the center, the Ultravid is probably a bit sharper, but at the edges, the Trinovid is definitely sharper and clearer.
The other effect that I've noticed with the Trinovid vs. Ultravid is that the Trinivid (to my eyes) appears to have a more "natural" image quality that seems more like looking at the real world with the naked eye. The Ultravid seems "enhanced" artificially... even though the enhancement is for the most part positive. This is a purely subjective observation, which seems to be shared by several people I've talked to about the Ultravid... and most people like it. I find that I personally don't... but I'm definitely in the minority on this one so take it with a grain of salt and make your own observations.
Weight/Ergonomics is the final deciding factor between the 2 - the Ultravid is definitely lighter in weight and has completely different handling characteristics. I personally find the older Trinovid body design to be quite tank/brick/ultimately-solid like - more fitting with my own desires for a bullet-proof world traveling instrument. Most people will undoubtably prefer the Ultravid's lower weight and better handling characteristics - although there have been some complaints about the thumb indents. Again, try them both and make up your own mind.
Final result for me was purchase of the Trinovid, with the closeout sale price helping push me over the decision "edge". While the price did not make the decision for me, all other factors being weighed with far more gravity, it did "sweeten" the deal for me. Overall it was a tough decision, but the Trinovid just ended up meeting my own needs better.
In my opinion, the Trinovid is far from "antiquated" or "obsolete"... they still have a LOT to offer and with the current closeout prices the Trinovid is still worth serious consideration.
Best wishes,
Bawko