this is true, thats why i quit using my dads old miranda and my cannon rebel. but using slower speeds can compensate for the small negative side. specificly when blowing a 35mm negative that was shot on 25 or 100 iso film up to 8x10 you still get very good results, thats where having a lens that preforms better in low light gets a little handy but for me its not as important after i saw how well i did shooting 1 sec handheld and still got perfect detail on the icons in notre dame with a rollei i think id be able to hold a little 35 steady. the idea for the zm is for when i need a camera when im being more active but my subjects arent, the rollei is great for walking around on the street but cumbersome for say climing or hiking, but using the 35 with the 120 i can put the 120 in my backpack for when i climb hills, and still use both when walking around on the street. the rollei is an amazing camera, but its square negative makes it a vignette camera, for good action and dramatic more photojournalistic pictures a 35 or 6x9 is what is realy needed. and all the 6x9s ive used are too cumbersome aside from the graflex which i would use when detail is more important or i want large blow ups. basicly i have a different camera for every different type of shooting i encounter. france kinda galvanized this idea, i used my speed graphic for larger shots, crowd shots, and the rollei for intimate vignettes and detail.
anyway rambling over.