A comparison of three awesome pens from Pilot: the G2 vs the G6 vs the G-Knock. The pens are essentially the same, but have different bodies. One isn't necessarily better then the rest -- the difference comes down entirely to preference.
It's worth noting that they all use the same cartridge, so if you want 1.0mm ink in the G-Knock (which only sells in 0.5mm and 0.7mm), you can get a refill from a G2 and put it in the G-Knock (or G6 for that matter).
More information: http://penbase.wikia.com/wiki/Category:Pilot
1.0mm refills: http://amzn.to/2b9cHTn 0.38mm Pilot G2: http://www.jetpens.com/Pilot-G2-Gel-Pen-0.38-mm-Black/pd/268 G-Knock pens 12-pack: http://amzn.to/2b9csrG G6 pens 12-pack: http://amzn.to/2b9cDmZ
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If you like the Pilot G2 but are looking for an alternative then you've got to try the G-Knock...