With Tmax 100 and 400, unless you want a very, very large size, well over 16X20 modern film in 6X9 is large enough in terms of grain and resolution. What 4X5 brings to the table is for zone or BTZS users developing each sheet for a given scene. Second is perspective control, movements. The other is price, strange as it seems, lets say it is late afternoon, the golden hour. I come across a scene and have time for only shot before the light changes. I grab by Crown set it up, get basic exposure data and get in the one shot. I'm using Foma 400, cost is less than $2.00 U.S. If it was the first or second shot on Foma 120 400 it would cost $6.40. Now if I want to wait until I shoot the entire roll no problem. But in this case I really to print this shot, only the one sheet cost is $4.00 less than than wasting the roll of film for just one shot. Of couse it could be just the opposite, it is my last shot of 120, shooting 120 is cheaper.