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Hmmmm, 35mm, 150mm. I'm spotting an obvious flaw in your suggestion.....
Last summer I went in a two weeks trip with D600 + D5200 and this Sigma trio:
8mm f/3.5 circular fisheye (spectacular also)
I was very happy, mixing the 35/150 between the FX and DX senzor. Only in a few situations I wished a wider lens. Next time I will replace the circular fisheye with my 16/2.8 Nikkor diagonal fisheye and I will be served.
Honestly if Sigma will rework its 20mm f/1.8 lens I think I can use exclusively Sigma glass on my Nikon bodies. I dream to find funds for Sigma 120-300/2.8 Sport... then I can stop looking for anything else
Ah, uh... I forgot to say that in a local photo competition I won a Sigma DP2 Merill which is the sharpest photo device I ever used in my life. It is really spectacular, with lot of shortcomings, but the IQ is unique.
Sigma definitely is a game changer and in the coming years will lead the innovation. Hopefully keeping an affordable cost.