If you are shooting 120 film, what lens will be able to give you a resolution beyond the frontiers of Acros or Tmax 100?
It isn't a matter of lens resolution Vs film resolution. Grain size has to be far finer than the lens resolution and decreases in grain size translate into improvements in the image.
Take a hypothetical worst case where the lens resolves 1 lp/mm and the film resolves 1 lp/mm. The film can have a grain size of 0.5 mm and all is well. Except that the only two tones that can be reproduced are black and white and no shade of gray is possible at the limit of resolution. If the grain size is 0.25 mm then 2 shades of gray can be resolved at the limits of the lens. If the grain size is fixed at 0.5mm then only features at 2 lp/mm can be resolved with two shades of grey. The smaller the grain size the more shades of grey can be realized, even though the image spatial resolution is still fixed at 1 lp/mm.
It is not the resolution that sets large-format photographs apart so much as the low contrast fine-detail that can be resolved. It's a simple matter of grains of negative image per area of print image. When it is a contact print the tonal resolution is at a maximum. I know of someone who wants to reduce 8x10 negatives down to 4x5 prints to get even more tonal depth in the print.
The same logic holds for ink-jet printers: they all print at 300 dpi and have the same resolution, but the more dots/inch the printer can lay down the better the fine detail it can show. High end printers can also change the size of the individual dots for even finer grey scale gradation.
TechPan differs from microfilm in that the grain sizes in TechPan are not uniform allowing it to have more gradation at fine detail than the simple grain size would indicate. Microfilm uses a uniform grain size because this gives high contrast and makes for a cheap film emulsion, both are plus features for making copies of newspaper pages. For pictorial effects this uniform grain size is a real problem and although compensating developers can be used to get some grey scale out of a microfilm the results look nothing like well done TechPan.
We think of black & white pictures as two dimensional. They aren't. Along with the X and Y location of a point on the image there is a third dimension of the tone at that point. TechPan film has superior resolution in the tone dimension, and the results really are 3-dimensional. More and finer grain means more information in the photograph, the limit isn't set by the resolution of the lens.