Not that I know of but the published benefits look like crap.
Even the 25% tier bonus is only for full fares.
Receive a 25% tier bonus on the actual number of miles flown on Singapore Airlines, SilkAir or Virgin Atlantic when you credit the miles to your KrisFlyer account. All Singapore Airlines and SilkAir booking classes except for Economy Class tickets issued in G, K, N, Q, T and V booking classes are eligible for this bonus.
CX Silver gets lounge access, priority baggage, and better seat selections.