Upload & Sell: Off
I say the following is best:
Keep the 16-50, it is made for the body, it is the right range, and Sony put plenty into it, it is very sharp and has few faults especially as a 'kit' zoom, might be the best one so marketed.
So that gives you ~24-75mm, very useful for most needs, and at f2.8. Its about half a heavy as the ZA zoom, much cheaper. You then have a free hand to buy more (!), free of the burden of doubt about the gen purpose lens.
Leaving what? You list fast 35/85s, Zeiss has a new 50mm coming out in 2012, and Sony (despite fanboy angst) do not hold back much on getting releases out the door. I could easily get interested in this one:
So that is a fast modern Zeiss on a top sensor, with 75mm reach, you get the centre res, so if it is a Planar, all the frame will be great on APS-C. The sensor will not get past it.
You need a great 24-25mm to get a 35mm - happens to be a fine 24/2 in the ZA line: http://www.bhphotovideo.com/c/product/731694-REG/Sony_SAL24F20Z_Distagon_T_24mm_f_2.html
Zeiss have also the new 25mm f2 for Canon and probably Nikon F mount. We have high hopes for this one, and any corner issues don't matter on crop sensors. The design looks like they did the job well. Here is a link:
Jorge liked it. F mount ZFs fit Sony via a Leitax mount (as good as original).
As ken says, always keep up with firmware with Sony, they get so many cameras out the door, its hard for s/ware to keep up, and we see good improvements in f/w for most bodies, the A77 will be no different.