Personally, I would go for a flavour of 85mm. If you need the macro, then keep the 100, if it is not important then sell it, and use the money for the nicest 85mm.
I keep coming to the precipice of getting the 135mm to complete my trinity and then drawing back. As other's have said, the 85mm is a more versatile f/l, allows you to communicate with your subject more easily, and there is plenty of background compression and bokeh when shooting wide. After the initial euphoria of the 135mm, I'm not sure how much I would use it.
Waiting patiently for Sigma to come up with an Art version of the 85mm. The Canon 1.8 is fantastic value for money, but the CA in some contrasty shots can be awful.


