Carbon Fiber should be the choice material for boats??

Kevlar would be the best choice for impact resistance. It has a higher sheer strength and it's more resistant to abrasion. Carbon fiber has great tension and compression properties. It's stiffer and lighter than Kevlar, but more brittle. Ultimately, it's a matter of structural engineering, laminate and insulation. I sea trialed the all-carbon Delta 54 while in Monaco and it was quieter than many other boats I've been on in that size range. In contrast I've been on a custom built, all-carbon raceboat that resonated every slap of water against the hull.

Capt J, could you elaborate more on what type of noise you're hearing on those cold molded hulls? Engine noise, wave slap, machinery vibrations, etc.? I'm asking in all seriousness because all of our hulls are also cold molded with an Aramid outer skin and I haven't observed any noticeable difference in sound transmission through the hull compared to "regular" E or S-glass sheathed hulls. If there's an issue I'm not aware of I would very much like to learn more. If you prefer to keep it private a PM would be fine as well.

CF hull triples the build cost.
Recently I ran a boat for a survey that had a 14 year old CF mast. The mast had electrolysis damage from the aluminum boom. Never would have guessed that could occur.
Carbon would be my material of choice if you could fund the build.

I hope you will post these details here as I have been following the cold mold threads elsewhere and new info is always appreciated.

While in years past the "triple" cost may have been true, in the 21st century the development of new techniques, as well as technology, have changed that number. Look at how carbon fiber is being used in aerospace, and is finding use in commercial vessels as well.
In the overall cost of a yacht, most particularly one where the weight and strength benefits of carbon fiber come into play, the actual percentage of the total build cost to generate the carbon fiber structure is a small part of the grand sum.

Many composite builders use carbon fiber in their critical area build ups. In the past they would use a much heavier build up of glass in the prop pockets and where appendages were to be attached like struts rudders and stabilizer box's and keel box's . Now in lieu of the beefed up glass layup they're just laying in a few runs of C.F with the best of both components , strength Vs weight. Christensen likes to advertise it's famous
" Two point pick" and when you look at all the unsupported space between the dollies it's a good testament to the strength of CF

As I look around my office at all the high strength structural composite sample parts and test pieces, it really puts it into perspective the ever changing technologies for manufacturing. When you compare the ferrous metals industry really coming about with steel production in the 1850’s, composites is essentially still in its infancy and very much unknown in its uses and capabilities over steel to the general public. As CaptPKilbride touched on the cost factor of Carbon and all composites essentially have reduced from a manufacturing and material cost standpoint, and as much as aerospace has driven those cost down with manufacturing techniques, the auto industry is really pushing it to new levels of layup/molding/resin technology which will spread into the marine industry as both are mindful of manufacturing cost compared to aerospace. For me if I wanted performance, ride, and strength for a SF hull I would build with a hybrid of S-glass/Aramid for the hull and carbon fiber for the toilet seats and interior.

Isn't the Revenge (Sam Jennings' boat) a carbon fibre hull?

I believe that would be Jon Sadowsky who worked with Jim Smith and recently passed away that built the Revenge.