According to Wikipedia, ECIES requires a key derivation function. I already have an implementation of PBKDF2-HMAC-SHA256 in my library, so I could use this.
Is PBKDF2-HMAC-SHA256 (salted of course) sufficient as KDF? Or should I use another KDF?
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Why would you do that? It's the Password-Based Key Derivation Function 2, and ECIES doesn't work with a password but with a DH shared secret, thus not suffering from the same issues that plague passwords (such as low entropy-density).
Not to say it wouldn't suffice, but if you need something a straight hash or HMAC doesn't provide, KDF1 and KDF2 are your friends.