I have always said the best zoom is a prime and a good pair of legs. For portraiture I prefer an 85 or a 135. If the 75 is not quite long enough you may find the 85 also not quite long enough. The 135 f2 is an awsome lens and does not cost as much.


I have the 24-105. For portraites I find myself using it at 105 f4.5 quite a bit. For a head shoulders shot at 105 f4.5 I get good sharp shots with a very nice background blur and do not cross that comfort zone line. One of these days I plan on getting the 135 f2 for these shots.


I do find myself shooting at the 24 to 35 end for full length portraits but do not see the need for shallow DOF on these so my lens works great.


I say make the switch.


Mark