They say (bolding is mine)...

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Collection 1: Features Soprano, Alto, Tenor, and Bass voices perfect for gospel, worship, and backings for pop, R&B, rock, and electronic music; recorded in English.
Collection 2: Features Soprano, Mezzo-Soprano, Tenor, and Baritone voices suited for classical, operatic, and cinematic scoring; recorded in Mandarin.
Collection 3: Features Soprano, Alto, Tenor, and Bass voices ideal for folk, hymnal, and ceremonial styles; recorded in Japanese.

Each collection includes 16 distinct solo voices (4 Sopranos, 4 Altos, 4 Tenors, 4 Basses), 3 vocal modes (Bright, Rounded, Smooth), and supports 6 languages (English, Mandarin, Japanese, Spanish, Cantonese, and Korean).
If collection 2 was recorded in Mandarin and collection 3 in Japanese, how good is the English for these? Does it sound like natural English (and I know there are varieties of English)?