Difference between 203 and 225 is night and day. I also much preferred the first 10.5 on the KT to the 8.8cm (it's not the long 8.8cm anymore, title taken by the 8.8cm L/100 on the E-50).
The gun turns the King Tiger from a heavily armoured tank which can damage most tanks of it's tier reasonably well into a tank that can demolish anything it's tier.
		
		
	 
Well I already felt like the KT could demolish anything in its tier even with the 88/L71, haha.  Err, well except the T28.  God I hate going against those things.  I know I can pen the lower glacis or the cupolas, but damnit they're still scary.  Ferdinands are a little scary too.  Before that, I found IS-3s challenging until you pointed out to me that the 88/L71 can pen the front XD  I haven't gotten a chance to go head to head with an IS-3 yet with the 105mm but I'm sure it'll be even easier now.
Of all things I swear it feels like I'm bouncing off of Lowes more than with 88/L71.  I'm sure that's in my head but I mean geez.  Front armor (which should be smashed by the 105), side of turret (wat), bah!
I guess I just need more time to feel out the gun.  Been using the 88/L71 so long, so I've grown to know/tolerate what it bounces off of.  I was hoping that with the 105, I'd be able to take shots that I previously couldn't or I wouldn't have to aim as carefully or something.  But that's not really reasonable lol.
But I think it's more that I should still go for the exact same shots as before (well, a few doors are opened, like pen'ing Ferdi superstructure or JT any non-superstructure, and probably tier10 sides will be less bouncy to me), but I'll get a lot fewer bounces now.  I bet I already experience way fewer bounces but just feel bad b/c there several very memorable "NOO WHY DID THAT BOUNCE?!" moments.
Oh, and now my survival rate (48%) is higher than my win rate (47%)!  FAIL.  My global win rate is 53% and most of my tier6/7 tanks are above that (KT is my only tier8 atm).  I dunno why I can't keep a good win rate in this tank... my avg exp is like 820 (my best of any tank) and I'm doing more than my health in damage on avg.  Is it b/c doing damage + staying alive isn't enough anymore in tier8?  Maybe I don't do enough to help my teams, I dunno if it's me or them 

  Maybe I should play TCs...