Kiri-Same is a lovely grey that leans purple with my pen and paper combos. I was afraid it was going to be similar to Montblanc Oyster Grey, which, to my eye, seems to lean brown or taupe. Some people refer to Kiri-Same as a warm grey, but I think it is a cool grey; not as cool a grey as Fuyu-Syogun that leans blue, but still on the cool side of the colour spectrum.
Kiri-Same is lighter than my beloved richly coloured Diamine Earl Grey. Kiri-Same is the same tone as Kobe Mikage Grey #10 but much lighter. Like the rest of the Iroshizuku inks, this ink performs flawlessly in all my Sailor 1911 L and S pens, with all nib sizes from H-EF to H-B, even in my 1911S 21kt H-M, which is a dry writer. I prefer using Kiri-Same with my wet H-MF Lefty nib and my Kaweco Anthracite AL Sport sporting an F steel nib because the ink shows subtle shading in these two.
I’ve observed no smearing (it dries quickly!), skipping, hard starts, nib dry-out, bleedthrough, or feathering; there is some ghosting on thin stationery from heavily saturated areas. It is readable in all nib sizes and on all papers; the only paper that gave me grief was the Oxford Optik paper, on which many otherwise well-behaved inks tend to feather on it to begin with.