Tricky one, but 3 things I observe:
- Perhaps you are less bothered about size and weight (you have the 50-140 after all!)
- You have a broad range of interests (portraits/landscapes/astro), and this tends to drive conflicting design priorities (speed, size, weight) even at the same focal length.
- All of the lenses you mention are good, they just have different design priorities. I've owned them all, but out of those you list, I only still have the 16-55 and 50-140...
Personally, I don't think you will ever go wrong with the 16-55 unless you crave those very compact primes that Fujifilm offers. And, even in those small primes, if you think of the 16-55 as an alternative to the 16/2.8, 35/1.4 and 50/2, it's basically the same weight as those three.
You mention 35/1.4 for portraits.... I'd argue you that already have an excellent and perhaps more suitable lens for this in the 50-140 (by virtue of the longer focal length). I am assuming here that you don't mean very low-light portraits ;-)
16/2.8 is a nice lens, but to me it's not really wide enough for landscape, even though it's actually a bit wider than 16mm. IMHO, while it's fine at typical landscape apertures, it's unexceptional at wider apertures, so a bit of a one-trick pony (it's trick being to be very compact and light).
The 10-24 has the width, but not the speed for astro. I would recommend the Viltrox 13/1.4 as an alternative that will do well for landscape and astro and is about the same size and weight as the zoom.
As I think has been mentioned, the 8-16 is fantastic (I've hired one), but cost, use of filters, size and weight might be issues.
So, for your interests, I would recommend getting the 16-55 and then adding in a wide, fast prime under that. Viltrox 13/1.4 as mentioned, or the budget option of Samyang 12/2 MF, if you're OK with manual focus only.
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The camera is not your tool. The light is.
Tim
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