The nib has more rounded edges than my Parker italic nibs (my 'go to' nib) and in many ways is more akin to the Lamy Joy calligraphy nib (a.k.a. the Lamy Joyless to me... see here for why!).
|Clockwise from L: TWSBI, Parker italic, Lamy Joy(less)|
|TWSBI on left; Lamy Joy(less) on right|