Friend of mine bought Meoptar meostar b1+ 8x42 and I have some chance to compare it with Zeiss SFL 8x40.
Even it have 2mm more lens diameter, it is much bulkier and heavier (alost about 300g differ!)
than SFL 8x40

you can see meostar is much thicker

1. meostar b1 + 8x42

2. sfl 8x40

meostar have significantly more pincusion distortion than sfl
plus, meostar has bit of yellow - green hue while sfl color is very close to neutral with very,very little bit of green emphasizing
So, Meostar's view is lot warmer than SFL
meostar / sfl

so the size of the circle is significantly bigger than SFL even real FOV is little bit wider in SFL
up : meostar
down : sfl

CA control in center is little bit inferior than sfl
meosrar / sfl

Comparison result.
1. Brightness
meostar =< sfl.
hard to find difference, but I think sfl feels slightly brighter. maybe due to it's more transparent colors.
meostar may be brighter at low light due to 2mm more lens diameter
2. Center image sharpness
meostar < sfl
clear win for sfl
3. Sweet spot
meostar = sfl
sfl has slightly wider FOV but meostar is slightly better off axis (about 1~2%)
4. CA control
meostar < sfl
sfl has little bit more off axis CA and meostar has more on axis (centeral) CA. center is more important, so the point goes to sfl
5. Distortion
meostar < sfl
another clear win for sfl as you see from photos above.
6. 3D rendering
meostar > sfl
clear win for meostar. due to it's distortion and bigger lens diameter, meostar view has more 3d effect than sfl.
7. Stray light control
meostar < sfl
8. close focus
meostar < sfl
sfl close focus is about 1.3m and meostar is about 1.8m
in real life measurements.
10. eye placement
meoster < sfl (for me)
longer, thicker eyecups of sfl fit's better then meostar to me
real life eye relief seems similar
11. Focusing
meostar < sfl
sfl has much bigger focuser and much slimmer body.
it is much easier to control the focuser of sfl.
12. Handling.
meostar < sfl
meostar is much heavier and thicker. unless you have very big hands, I think sfl is much better to hold on.
13. Build quality
meostar > sfl
while sfl looks like sports car, meostar is a tank. eyecup, focuser, diopter is better made in meostar.
the rubber is much thicker and little bit more smooth feeling. thogh it has little bit of lifting of rubber around the hinge
14. Accessories
meostar = sfl
I prefer meostar's strap and pouch more and prefer SFL's lens cap more
Even it have 2mm more lens diameter, it is much bulkier and heavier (alost about 300g differ!)
than SFL 8x40

you can see meostar is much thicker

1. meostar b1 + 8x42

2. sfl 8x40

meostar have significantly more pincusion distortion than sfl
plus, meostar has bit of yellow - green hue while sfl color is very close to neutral with very,very little bit of green emphasizing
So, Meostar's view is lot warmer than SFL
meostar / sfl

so the size of the circle is significantly bigger than SFL even real FOV is little bit wider in SFL
up : meostar
down : sfl

CA control in center is little bit inferior than sfl
meosrar / sfl

Comparison result.
1. Brightness
meostar =< sfl.
hard to find difference, but I think sfl feels slightly brighter. maybe due to it's more transparent colors.
meostar may be brighter at low light due to 2mm more lens diameter
2. Center image sharpness
meostar < sfl
clear win for sfl
3. Sweet spot
meostar = sfl
sfl has slightly wider FOV but meostar is slightly better off axis (about 1~2%)
4. CA control
meostar < sfl
sfl has little bit more off axis CA and meostar has more on axis (centeral) CA. center is more important, so the point goes to sfl
5. Distortion
meostar < sfl
another clear win for sfl as you see from photos above.
6. 3D rendering
meostar > sfl
clear win for meostar. due to it's distortion and bigger lens diameter, meostar view has more 3d effect than sfl.
7. Stray light control
meostar < sfl
8. close focus
meostar < sfl
sfl close focus is about 1.3m and meostar is about 1.8m
in real life measurements.
10. eye placement
meoster < sfl (for me)
longer, thicker eyecups of sfl fit's better then meostar to me
real life eye relief seems similar
11. Focusing
meostar < sfl
sfl has much bigger focuser and much slimmer body.
it is much easier to control the focuser of sfl.
12. Handling.
meostar < sfl
meostar is much heavier and thicker. unless you have very big hands, I think sfl is much better to hold on.
13. Build quality
meostar > sfl
while sfl looks like sports car, meostar is a tank. eyecup, focuser, diopter is better made in meostar.
the rubber is much thicker and little bit more smooth feeling. thogh it has little bit of lifting of rubber around the hinge
14. Accessories
meostar = sfl
I prefer meostar's strap and pouch more and prefer SFL's lens cap more
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