A6400 vs A6700

Hi everyone,

Help me decide. I’m really torned which will I choose and best to invest with. I dont know if I will choose to buy A6400 or A6700 and here are my dilemmas

If I buy A6400, I would probably get a good lense of Sigma 17-40mm f.1.8

But if I buy A6700, I would buy a kit lens only due to limited budget considering the body cam itself is pretty expensive already.

Should I go for option 1 by focusing with lens investment or option 2 by focusing with body investment?