The obligatory what lens thread...(Destination: Spain)

I know these threads pop up reasonably frequently but I'd appreciate some input please.

I am heading to Spain for two weeks (Madrid, Segovia, Toledo and Salamanca) and I am trying to work out what to carry.

I have a 6D, 17-40L and 24-70 2.8L Mk2 which I think are a given.

I also own the 100 2.8L Macro, the 50mm 1.4 and the 70-200 F4L/IS.

The 50mm is fast but the images from it have never really impressed me. I'd like the Zeiss equivalent but after buying the 24-70 and 6D funds wont allow.

I'll take an Oly OMD with 20mm pancake for wandering the streets at night and for when my back needs a rest.

Do you think I would get much use out of the 70-200? I can envisage the macro being useful but I want to limit myself to 3 lenses. I'll probably also take a 430EX flash and small tripod

Any tips, hints or advice welcome