I own a Model 02 in black & cinnamaroon with the old clip, a Panther 40 in black & emerald with the small clip, & a separately bought #6 steel broad SIG.
Favorite F-C nib is the Masuyama broad italic, which resides in my Scriptorium. The Masuyama broad stub in the Panther 40 is close behind, & the broad SIG ithat replaced the italic in the Model 02, while a fun nib, is currently in storage after the last time I pared down my inked pens to travel.
My experience with CS is (fortunately, I would say) limited to a quick email exchange to ask if I wanted a clip on my Panther before sending it off.
I prefer to feed the F-Cs Iro inks. Kon-peki, Ku-jaku, Tsuki-yo, Syo-ro, Ina-ho, Shin-ryoku, Yama-guri, Tsukushi. I would say my italic runs ~4/10 in wetness, with the Iros knocking it to ~5/10. The stub is more like a 5/10 with Iros knocking it to ~6/10. Iirc, the SIG is about on par with the stub in that regard, but polished slick instead of having the pencil feel of the Masuyamas.
Here's an old writing sample on Clairefontaine, 8mm line spacing. Need to redo something like this at some point, since the printing was done on a 45 deg angle rather than parallel to the line & so doesn't show the line variation off well.
Another old sample, iirc on Rhodia. Syo-ro & Kon-peki are the stub, Tsukushi & Yama-guri are the italic, Tsuki-yo is from a Bexley 14k stub.
Closest I have to cheap paper at hand is a few pages ripped from a notebook I didn't buy, so I have no idea where it came from. The italic does ok, but the stub has (& thus I would imagine the SIG would have) very minor feathering & shows through a bit on the other side, but you could maybe get away with using both sides. Neither the italic nor the SIG have ever caught while writing that I can recall.
Edited by NinthSphere, 21 May 2018 - 07:51.