The thing is, the best always end up in the fastest cars and generally have "inferior" team mates. However in Lewis' case you can argue he's had quite a few who are no slouch (Alonso, Button, Rosberg and now Russell) and he's raced all with equal treatment.
Its actually where he looks much better compared to drivers like Schumacher (Brundle, Patrese, Herbert, Irvine, Barrichello, Massa, Rosberg) and Verstappen (Sainz Jr, Ricciardo, Gasly, Albon, Perez).
I think you could argue the only driver to have had better team mates overall is Prost (Lauda, K Rosberg, Senna, Mansell, Hill, among others).