I have the 10/24 in addition to the 18-135 and TBH I don't really know why I bought it ,it very rarely gets used so personally I don't think I would bother with one especially as the XT-3 has a very good panorama setting which negates the need for the 10-18mm FL.
Like soeren says the 60mm macro is a good portrait lens if you don't want to lay out for the 56 1.2 and TBH you are not going to use it wide open very often ( if at all as the DOF is so narrow).
Get either the 60mm or the 56 , whichever floats your boat and then splurge on the XC 55-230 , cheap as chips either used or from e-infinity and remarkably good value for money (personally I would get the 60mm )