Paid a visit to the pub with a moleskin to work on some ideas for NaNoWriMo.
I had a Aspara Platinum Extra Dark, a Blackwing 602, a Tombow Mono 100 Hb and a Mistuishi Hi-Uni 2B - I had a KUM long point sharpener on me.
I filled out two and a half pages of freewriting (bleep) using all 4 pencils and the same sharpener.
Notes on the 4 - the Aspara gave a much broader line than the other pencils. The pencil would not come to a sharp point - but rather a rounded point which did last for a long time, but gave a much broader line than other pencils. Fine if you are writing for yourself (which I was) but if you want to make something neater or more impressive - try elsewhere.
The 602 had a similar issue. It came to a long round point rather than a sharp one. It was sharper than the Aspara, but not pointedly sharp.
The tombow was the best of the 4. The HB came to a sharp needle point that stayed for a long time - also the Tombow laid down a darker line than most other pencils. I got a much thinner line - and the pencil retained a much sharper point for longer.
The Mistubishi was the smoothest writing experience. The 2B lanes down a nice line, but I could feel the pencil melting as I wrote. It was the nicest, and creamiest of the 4 to write with, but it was the one that lost its point the quickest.
So, of the 4 I used - with the sharpener I had, the Tombow Mono HB came top. A separate lead sharpener would allow me to get the Aspara and the 602 to much sharper points - but the tools you have are the tools you have.
All the pencils were useable, they all wrote, but were not all equal.