All Sony mobiles released before the CMD-Z1 were manufactured by Siemens. Hence the closest competition for the CMD-Z5 is the Siemens S35i (released in April 2000, unlike the CMD-Z5 that came out in Singapore in June 2000). The Z5 looks smaller, but unlike the S35i has an aerial and a flip.

I had to do a lot of research before settling on one of these two phones, and in the end the Siemens had most the features of the Sony at less than half-price (The price for the Z5 in Singapore in June 2000 was $SG 1100, and the Siemens S35i was around $SG 450. Prices do not include the $SG 100 SingTel NSCK disconnection fee and apply to non-contract binding phones).

Nevertheless, Sony CMD-Z5 offers spectacular features, and is definitely the phone to get for those who can afford it. For the rest of us, I would recommend the Siemens S35i.