Could be? I would be interested to hear your thoughts on this. The difference in hard values and range is quite significant. I believe the combat value of a StuG III G was quite good, and i think the best crews racked up quite a big number of destroyed enemy AFVs.
Found this:
http://www.achtungpanzer.com/sturmgeschu...utz-iv.htm
For an example:
The most notable Waffen SS Stug ace was SS-Sturmbannfuehrer Walter Kniep, who commanded the 2nd Sturmgeschuetz Abteilung of 2nd SS Panzer Division "Das Reich". From July 5th of 1943 to January 17th of 1944, his unit claimed destruction of some 129 Soviet tanks, while losing two Stugs. Kniep was then awarded the Knight’s Cross.
Overall, Sturmgeschutz series proved to be very successful, and served on all fronts as assault guns and tank destroyers in both offensive and defensive mode. Sturmgeschutz III with its low silhouette was a difficult target and a dangerous opponent. Sturmgeschutz crews were considered to be the elite of the artillery units and were issued special field grey (version of panzer) uniforms. Sturmgeschutz units held very impressive record of tank kills some 20000 enemy tanks by spring of 1944