Well was looking if such question does exist here:
since i have both on hands i can maybe contribute with my deffinetely not proffesional knowledge.
To start since vsf got lengendary fame: they are close.. i do find differences that gives the vsf the edge -besides always the movement - but only one is the one i would consider worth the extra bucks.
btw the vsf movement has a small issue i hope i will fix. It stalls every half an hour -not consistenly -changing the time. the minutes do stall every now and then but is not catastrophic it does continue after you continue turning the crown.
Down to my observations:
CASE:
Bad way to start, call me noob but i cant say wich is better. vsf does look having better shaped crown guards if thats whats called.
BEZEL INSERT:
the only obvious big difference: slightly faded insert on the rlx. Vsf has more contrast on the bezel numbers. both nice and precise etched numbers.
BEZEL:
rlx has a bit play on the bezel, vsf is tight - nice there.. I find VSFs bezel turning quite noisy nothing big there i would just prefer the rlx clicking sound. vsf feels better when turning too.
bezel teeth very similar cant tell wich is better. ceramic looks same colour to me.
PEARL:
Both great, vsf is a bit dirty on the nickel base hope is not oxidation by the glue -if they use glue. we talk about 10X magnification here.
SAPHIRE - CYCLOPS:
yes we all know black hole effect- saphirre is top on the vsf. But honestly i try but cant see difference even on the black hole effect between the two versions. Was sure vsf was much better but no.
DATE:
vsf has better font on some dates, and has a nice click sound on transition when turning by time- perhaps is the movement here-. I like looking at the dates on the vsf maybe better zoom or bigger dates on the date plate. cant tell why, maybe printing fills more the space on the date wheel?
it does have a strange transition on the date plate. Dates seem to play a lot when changing manually dates.
SELS:
slightly better fitting on the vsf sels. nothing major.
CROWN AT 6:
omg rlx has a perfectly shaped etched crown in there. vsf is sloppy on the upper part
LOGO on the dial
vsf looks it has a tiny bit better font. i might be wrong. looks like is have a better contrast - crispier lettering too. minimal 10x stuff here.
HANDS - INDICLES:
both look great in hands and indicles.
INHAULT engraving:
vsf is clearly much better here. some letters look funny on the rlx. laser engraving it self is again better on the vsf.
CROWN:
Both great among the best i ever had, vsf slightly cleaner look on the rolex crown.
CLASP:
tbh i dont know the gen crown recession on the clasp, vsf is much more recessed in the clasp. if that makes sense. is almost even with the rest of the clasp, rlx has thick crown if i would choose it would be the vsf
BRACELET:
Brush looks same to me, shine, material great on both. cant tell wich is better , could be smoother on the inside edges.
DIVER EXTENSION:
Rlx is easier to move arround on the rail system, vsf is stiffer. Is personal i guess- i prefer stiffer.
Surprised with rlx wonder why is not more "famous" among the rep fans in here.
cheers guys