At the lowest comparable latency (4 tokens), MILk is 1.5 BLEU points ahead of wait-k. EnFr is a much easier language pair: both MILk and wait-k maintain the BLEU of full attention at lags of 10 tokens.
we were surprised to see that this does not mean we can safely deploy very low ks for wait-k; its quality drops off surprisingly quickly at k = 8 (DAL=8.4, BLEU=39.8).