ZRH is very premium heavy, however mainly J. Having a large J cabin is more critical for economic success in this market. Y is generally the most difficult out of ZRH. That's why SQ operates a 388 version with more J to ZRH (and LHR). When CX changed some European destinations to 359, some expected the same to happen with ZRH. I understand this did (so far) not happen because of the lack of J ... So perhaps the 351 is a good guess? Does anyone know its J capacity?