Your wish is my command:
2013 Hamilton : 11 vs Rosberg : 8 (58% / 42%)
--- Total avg diff : -0.158
--- Total avg per km : -0.025
2014 Hamilton : 8 vs Rosberg : 10 (44% / 56%)
--- Total avg diff : -0.023
--- Total avg per km : -0.002
2015 Hamilton : 12 vs Rosberg : 6 (67% / 33%)
--- Total avg diff : -0.154
--- Total avg per km : -0.031
2016 Hamilton : 12 vs Rosberg : 7 (63% / 37%)
--- Total avg diff : -0.042
--- Total avg per km : -0.009
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2017 Hamilton : 13 vs Bottas : 6 (68% / 32%)
--- Total avg diff : -0.203
--- Total avg per km : -0.029
2018 Hamilton : 15 vs Bottas : 6 (71% / 29%)
--- Total avg diff : -0.172
--- Total avg per km : -0.032
2019 Hamilton : 14 vs Bottas : 7 (67% / 33%)
--- Total avg diff : -0.122
--- Total avg per km : -0.025
2020 Hamilton : 6 vs Bottas : 2 (75% / 25%) (so far)
--- Total avg diff : -0.302
--- Total avg per km : -0.062
As I said previously, numbers without context and cirumstance. Only comparable sessions to another, so if one driver failed to make it to q3, q2 was used etc. Numbers are what they are.
Interestingly, Bottas is not that bad at 0.030 in Hamiltons favor per km. Rosberg was definitely closer though in 2014 and 2016.