I'd love to see the same eyepiece used for a 7x35 E2. That would be an incredible instrument and half the price of the Leica 7x35. More like 1/3rd the price. For some reason the 7x35 E2 is not happening, we're left to forage around the internet looking for vintage ones in good condition.
I liked the impressive depth of the 7x35 E. It was sharp nearly to the edge, but it's 7.3* FOV only provided a 51* AFOV, which felt tunnelesque compared to the Nikon 7x35 WF with 9.3* FOV. Despite the larger FOV, the sharpness at the edges weren't compromised. That's what impressed me and started me buying Nikons. That and the fact they didn't cost an arm and leg like Swaros, Leicas and Ziess bins.
I sold the 7x35 E, but I still think I have the Nikon 7x35 WF somewhere. It's been MIA for about a year. I also had a Nikon 8x35 WA but didn't like it because of its ultrafast focuser. Odd since it othewrise looked identical to the 7x35 WF. Both had very short ER. Didn't bother me, but not good for eyeglass wearers.
Then I bought an 8x30 E2, and I found "The Better View Desired" with its 70* AFOV and full mullticoatings. This was the first version E2 with the gray body and filmsy leatherette coverings. Then the black body version followed, and finally the 2017 Anniversary Edition with its much improved coatings (and perhaps upgraded glass). Those are the best but I rarely use them since they are a collectable.
Nikon could have upgraded the coatings and increased the ER on the Nikon WF, but instead chose to make lower priced 7x35s in its Action and Aculon series. The 7x35 Aculon had super sharp optics due to aspheric optics, but also steep field curvature and not even on both sides but offset to the left side, so the left barrels outer edge was out of focus and the right barrels inner edge. The twist-up eyecups were huge, couldn't get them in my eye sockets but fortunately, they had no kidney beaning, so I could put the eyecups all the way down and see the entire 9.3* FOV.
Hawke just came out with a 7x30 Marine Series bin (it has center focus), and there are tons of 6.5x roofs, but for the most part 7x30-something bins are no longer made. The last I remember before the Hawke was the Swaro 7x30 Habicht roofs that Steve Moore (mooreorless) had. He liked them for hunting since the focuser was at the bottom, so he didn't have to hike up his hat to focus in the cold (in addition to nature watching, he used them for hunting).
Given the aging population, I thought we'd see more 7x bins, but that doesn't seem to be the case. The 7x30-somethings and even the 7x42 are dying breeds.
So, it was refreshing to see Leica ressurect its 7x35 Trinnie. I look forward to trying one and seeing if the eyecups and ergonomcis work for me.
Brock