You know your INFI is sharp enough when...

[tomthebaker]

When it will cut the tops off my arm hair, without touching the skin, it is sharp.

Then, it will also do this: (click to watch)

 

[monk3yfist]

I use a small set of diamond stones and finish off w a loaded strop. Hair popping/shaving is good enough for me. I do the paper test to ensure that the edge is consistently sharp along the length of the edge.

 

[Gundog JYD#138]

As a wise man once told me. You know your knife is sharp when you can cut a fart

 

[Pokey1]

...when just looking at the edge brings tears of blood to your eyes.
...When slashing the air provides glimpses into the future.
...when the hairs on your arm jump off before you get to cut them and all you hear is a little eeeeeeeeee!!!!

Simple ... when Chuck Norris cuts himself

Sorry, Tim. Chuck Norris doesn't age. The world around him just gets younger.

I lovvee it LMAOO Chuck Norris jokes are always a plus :thumbup:

 

[NuclearWinterRat1]

...when Chuck Norris can use it to shave his Chin Fist and it only rolls the edge.