If you don't mind the hommage to Montblanc nature of certain Sailor pens, then I guess the money you save going with a wannabe might be worth it.
Maybe Sailor is paying homage to Omas or Sheaffer, who predate Montblanc with that general design. My 1911L is a much better writer than my 146; and strangely enough, even less of a nail. I would recommend one over a 146, unless somebody just had to have a piston mechanism or snowflake.
But to the topic - it's a Ford/Chevy tossup (or maybe a BMW/Mercedes tossup... ).
My 800s have always been buttery smooth, very wet nails. Finally got the Tortoise in yesterday, and it's no different. For construction, I think the Pelikan wins hands down. The removable nib and piston is brilliant. I like the aesthetics of their pens as well. I prefer the striated versions, and think that says "Pelikan" much more than the all-black.
The 146 is a pretty lady in a sexy black dress. Her "personality" may or may not be what you imagined, and they vary by specific example; but she'll always draw looks. The feeder case is in the top 5 dumbest pen designs ever. If it leaks, it comes straight to your fingertips and all over the section. You usually discover this when you remove the cap and have written 1/2 a page. I hate that it takes a special tool to get it apart. Nibs vary, and as I noted above my (late 80's) 146 is a nail.
The main differences I feel in hand are the section and the end of the barrel. The 800 has a slight curvature, but there's a step between it and the threads that can be clearly felt. I prefer the 146's section. I also prefer the gentle taper of the 146 at the piston end, and it seems to rest better in the webbing between my thumb and index finger. These differences are very, very minor though, and both pens stay in rotation.