I owned a '04 Road King Custom for years, and really liked the bike, also had a '05 Softail Deluxe. Both had a TC88 and 5 speed. I could ride the RK Custom for 4-5 hrs no issue, and the FLSTNI only for about 2 hrs max before pain. When I got my SF this past summer it has been the best of all worlds imho. I've road more in the past 6 months on SF than the first 2 years on my RKC. Which has been great!
Here are my Pros/Cons for SF vs RK, since you asked, and in no particular order.
SF Pros
Riding comfort level is much better on my SF (6'2" with 32" inseam") as compared to RKC... however I would still like to try a solo extended reach seat on SF.
Gas mileage is better on SF. 42.8 AVG vs 37 RKC... and I know I am not quite comparing quite apples to apples.
TS111/6spd is amazing vs the TC88/5spd.. duh... hate to think how much I would have paid to get 111ci on my RKC back in the day.
SF is already chromed/blacked out, you choose.
SF has a unique looks at bike nights * more on this later. I get more eye looking at the SF than RK ever did.
Ride Mode & ABS works very well.
Like the stock beefy pipes on SF... with the right amount of loud.
Bigger hard saddle bags... that remotely lock.
SAE connector under the little dash flip up, I use that for my USB connection, but know I am going to break it one day.
Dollar Value seems to go farther on the SF... take miles ridden/total cost = value
Mostly metric parts.
TPM works well
I can take the bags off and it still looks amazing, love those valanced fenders & hidden rear air shock.
SF Cons
Lack of color options for a given year, especially on SF, kinda takes away the uniqueness of the SF since all are the same color for 2 years.
Paint seems to get swirl marks by looking at it wrong, seems to be a defect imho.
Location of the rear shock air stem location, small thing but really annoying.
More catalog options & third party items for HD RK... still not sure this is a con yet.
Gas Tank Capacity... just think 4.5 gallons... forget the whole 5.5 claim... and just refuel every 230 miles.
Where is the USB Port in the nacelle? Oh yeah, not there.
Service, I am a little more concerned on the road due to the lack of Indian dealers. Hasn't been an issue though, which leads to I expect that the SF will require a little more planning for routine maintenance service when doing longer trips.
Meep Horn, absolutely had to replace it. Splurged and put on a 15" Buffalo Brand
Mostly metric parts... yes it can be both a pro & a con.
Putting air into the tires with a valanced fender... little issue.
No LED default front lights.
SF Wish List
Would like to see LED front lights, round air filter & heated grips standard on the SF, and the new Stage 1 air filter on SFDH
just my 0.02