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If going with primes, you might want to give thought to not deciding exactly which focal lengths, and instead make purchases in the general ranges, with an eye to getting the best possible IQ. For instance, 24mm needs can be met superbly with the Canon 24mm TS-E II, but also with the Zeiss 21mmand many landscape shooters who don't need tilt and shift would choose the latter. Same at the 85mm focal length; you can also consider the 90mm TS-E and the Zeiss 100 MP. At 50mm, just get the Zeiss 50mm MP.
What the online tests show well are resolution and distortion, but they do less to convey color and contrast.