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I always try to use 98 octane fuel - but I have not noticed any difference between the various brands.
I can confirm that there is a difference in using 98 vs 95 octane fuel.
Thankfully for us, the SVX uses direct-fire ignition and twin knock sensors, so that it is able to take advantage of higher-octane fuels by constantly altering the ignition timing.
I have also tried 100 octane fuel (Shell Optimax Extreme), but I could not detect any difference over 98 octane fuel.
Jason.
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1992 Charcoal Grey SVX - 165,000km
1992 Ruby Red SVX - 165,000km
....now with sequential VIN numbers! 
1986 Holden (Isuzu) Piazza Turbo - 225,000km
1993 Mercedes W140 S500 Coupe - 153,000km
1990 Mercedes W124 300D - 313,000km
EG33 + 4EAT + VTD AWD = SVX 
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