I think that the Type 4.2 (diagonal 66mm) is quite large for 99% of astronomical telescopes.
Even Type 3.4 (diagonal 55mm) is difficult to illuminate (and expect reasonable spots in the edge of the FOV) with anything smaller than a 4" corrector (and even the newest 4" Wynne from ASA is not that perfect overall as the older small 3" Wynne corrector was).
For me, I'd have a hard time to accomodate the type 3.4 with 55mm diagonal - though I'd like to see a large mono chip out there.
Reasonably would look the IMX161, maybe - even then we'd have to crop the edges and I think 55Mpix are more than enough (I currently have 36Mpix and had to buy a new PC to process such amount of data).
:)
BTW I have no clue about IMX161 specs, but just from the size perspective I think it may be the only chip from the picture to ever consider...
