Unfortunately, I didn't travel by Sapsan. Here in Belarys we have several new trains, which are more comfortable then "usual" trains. For example, there is a train from Brest to Minsk: http://brestcity.com/blog/shvejcarskaya-elektrichka-otpravilas-iz-bresta-v-baranovichi It is not as quick as Sapsan, just up to 140 km/h, and it takes about 3.5 hours from Brest to Minsk (~350 km). And it doesn't have "soft" seats, only "hard". So, when I travell to/from Minsk, I prefer to use other trains, where I could sleep. But these (we call them "swiss") trains - are also quite nice. :)
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It is not as quick as Sapsan, just up to 140 km/h, and it takes about 3.5 hours from Brest to Minsk (~350 km). And it doesn't have "soft" seats, only "hard". So, when I travell to/from Minsk, I prefer to use other trains, where I could sleep. But these (we call them "swiss") trains - are also quite nice. :)