[Elecraft] K3 - Performance on 6M?

[Jeff Cochrane - VK4BOF]

Hi everyone,
Sorry to trouble you all again but I'd like to find out more on the K3's 6M performance as very little seems to be mentioned on the Elecraft website.
The 6M band is rather important to me and my new station will have at least a 7 element yagi at 60' or so and maybe higher.
I currently own a late series Yaesu FT847 which has been my mainstay VHF/UHF rig since I was licenced a few years ago and it has a proven to have good performance on 6M and higher.
What I'd like to know from those of you that regularly use the K3 on 6M is what you think of its performance on that band, compared to other radios.
Is it sensitive enough compared to the other radios and if not, is the Elecraft pre-amp worth it or should I go for a masthead mounted pre-amp in preference?

Thanks in advance,

Jeff Cochrane - VK4BOF
Innisfail, QLD
Australia.
(But not for much longer!)