IIIc vs IIIF and IIIG

The late IIIc and early IIIf are virtually same. If you found the IIIc difficult to focus, then a cleaning may help, but the beam splitter or mirrored prism or both need to be replaced to bring it back new specs.

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A IIIc or IIIf with a properly serviced rangefinder apparatus is joy to focus with. I have a IIIf Red Dial and rarely use the ORAKO filter. The filter just isn't needed once the RF has been cleaned or refurbished.

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For whatever reason, the beam splitter and the mirrored prism seem to age better in the IIIf Red Dial and IIIg.

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The IIIg is taller than the IIIc and IIIf. It does have that nice viewfinder, but it retains the same RF design of the earlier cameras.

聽

To answer your question, no it shouldn't be easier to focus a IIIf or IIIg, but YMMV depending on the condition of the camera.