LOL. He really took advantage of the C330's macro abilities, i see...
I see your father was a more sensible shooter, opting for the fair priced and well-featured C330. He did care for his financial well-being!!
Returning to the topic, if Rolleiflex had made a model with a 105mm lens, or at least a 90mm lens, i would have kept one. I have passed many, many good (or even great) deals on beautiful Rolleiflexes because I don't feel comfortable with 75/80 lenses in 6x6. In 6x4.5, 75mm works just fine, but even then i do have a 105 for my 6x4.5 camera. Maybe Mamiyolleiflexblad owners crop their shots to 6x4.5, that's OK, but when i grab a 6x6 camera i'm intending to shoot square pictures, otherwise God has given us amazing 6x4.5 cameras from Bronica, Pentax, and Mamiya.
Right now my Salyut-S (this is like a Hasselblad 500C/M but cheaper, much lower shock/vibration, and a FP shutter instead of leaf shutter) has a 90/2.8 lens of Xenotar design. I am finding the 90mm focal length very nice.
Thus, i would really suggest the use of the 105mm lens on the Mamiya TLR cameras. The 65mm lens is also very good as a general purpose lens, with the "expansion" of space expected from a wideangle.