Lampard scored 16 in the English Premiership, 2 in the UEFA
Champions League and 2 in the English FA Cup and none at the
WC.
Whereas Kaka scored 14 in the Italian Serie A, 5 in the UEFA
Champions League but in Italy, they dont have a FA cup competition
therefore that was to Kakas disadvantage. He only played 38 games
compare to Lampards 43 (League & CL) + another 4 in FA cup
total 47
So if you were to take away Lampards 2 in the FA cup and base on
this, Kaka scored 19 goals in 38 matches, Lampared 18 goals in 43
matches. But more importantly, if you want to count all
competitions including internationals, Kaka scored 24 Goals to
Lampareds 20.
Juan Roman Riquelme also scored 24 in all competitions last season.
But look at his shot on goal in La Liga & CL total = 28 shots
with 14 goals. Lampards total = 73 shots with 18 goals. If you
were to see the ratio, every 2 shots Riquelme gets a goal
with
Lampard, he gets 1 goal in 4 shots.
Stats taken from ESPN soccernet. 