Is it just me or does it have a much wider spalsh than the plasma cannon while having the range of the Lascannon?

Splash is the same as the Plasma Cannon, though the damage-falloff is not as dramatic.

Range of the lascannon is because the Kannon has no ability whatsoever to defend itself when caught in close range, unlike the PC.

The Kannon also comes with it's own set of problems. Reloading is what usually gets me in the most trouble. I tend to forget, and someone comes charging at me, and I spend my last seconds reloading the weapon instead of firing it.

Not to mention looking through a transparent version of the weapon when braced, or the targeting oddities the size and placement of the weapon itself creates.

I do heart my Kannon though. Especially on the rear of unattended transports.

But does it need to have Mach 10 missle velocity?

Things that make you go:

That's something i also question myself a lot... The boom you hear is the ball breaking the sound-barrier, not the impact

Yeah the reloading gets me as well. I'm usually dead by the time I have reloaded after giving my position away after. Nice for those moments when you see a bunch of players are all huddled together but knowing your own death will likely be following shortly doesn't make it worth taking regularly in my eyes. Give me a plasma cannon any day.

I wouldn't say no ability exactly. Bouncing a grenade off a wall at your feet and jumping back will usually get someone if you d bash them right after. Its hard but doable.

Compared to the instant heavy damage snapshot of the PC, that is hardly consistently doable.

Having used both it definitely feels like the Kannon Deffgun is superior. it feels like the following,

1. Larger Splash Range
2. Higher Damage within the splash radius
3. These result in the ability to effectively kill from round corners or behind cover with little difficulty
4. (it cannot defend itself at close range) Wrong, It can kill multiple people at point blank range with ease(takes the users life as well but they are going to die anyway)

Overall the Deffgun just feels much better and much mroe powerful then the LSM counterpart. However I don't think the LSM Plasma cannon should be brought up but the Deffgun should be toned down a little.

True but it isn't completely defenseless. I've surprised my fair share of jumps who thought they had an easy kill. I got pretty good at throwing nades to create land mines where a jump will slam down and kill themselves.