Lewis Hamilton had several poor Race Starts this season but somewhat surprisingly they had very little impact on his finishing position. Four times this year he fell back from his grid position and finished behind where he started, losing a grand total of five positions.
AUS - Started 1st finished 2nd
BAH - Started 1st finished 3rd (hit by Bottas first corner)
ITA - Started 1st finished 2nd
JAP - Started 2nd finished 3rd
How does this fare vs Nico Rosberg?
Nico had a couple slow getaways but was generally the much better starter for 3/4 of the season. However, Rosberg lost positions from start to finish in six races, dropping a cumulative 14 places.
MON - Started 2nd finished 7th
CAN - Started 2nd finished 5th
GBR - Started 2nd finished 3rd
HUN - Started 1st finished 2nd
GER - Started 1st finished 4th
MAL - Started 2nd finished 3rd (Hit by Vettel first corner)
Let's look at it from a points lost perspective. If we assume a driver should finish where he starts, then Lewis' 5 lost places equal a potential 27 points. The 14 positions that Rosberg dropped total a loss of 46 points.
It is difficult to make a positions/points gained comparison because Hamilton started from P22 and P21 in China and Belgium, gaining 33 places in those 2 races alone. But if we look at just the races where they both started in the top three, they both advanced further up the grid on three occasions. Hamilton gaining 4 places to Rosberg's 3.