> I assume that a prime lens of 50mm, let's say a FA 50 1.4, is always going
> to be sharper than a FA 28-105 set at 50mm. Is this true, assuming that
both
> were set at the same f-stop?

I guess it depends on the f-stop. At f/8 the should givie similar sharpness.
Disclaimer - it's just a thought, i haven't tested it, so if you wanna prove
me wrong - go ahead.

>
> Question 2:
>
> Is a FA 100 2.8 Macro as sharp as a FA 135 2.8 at infinty for landscapes?
> Can I kill two birds with one stone by getting that Macro?

Killing birds is wrong. ;-)

Regards,
Lukasz

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