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In the repetition of the Shabbat amida, we who are not leading say all lines of the Kedusha, as does the shaliach tzibur.
In the repetition of the daily amida, only the shaliach says all the sentences of the Kedusha. We who are not leading say only the 3 main sentences.
What is the logic behind this?
(I have heard there are other customs, less often followed. Perhaps that is key to the answer.)
Related: Why is it common practice to say Nakdishach/Nekadesh before the hazzan?
In the weekday the Shliach Tzibur leads with leading phrases, לעמתם משבחים ואומרים, facing them [the other angels] praise and they say, and ובדברי קדשך כתוב לאמר, and in the words of your holy ones it is written. These phrases are preparations for the coming sentence. Since these are merely leading into the next stanza some have the Minhag that only the Shliach Tzibur says it.
However, in all Minhagim the whole congregation says וקרא זה אל זה ואמר in the first piece although it is of the same nature. This is because we are already saying everything until there. It flows with the rest of נקדישך.
On Shabbos, when we have a more elaborate Kedusha which expounds on the statements. Once we are already saying everything until לעמתם we don't leave it out since it flows with it as well.
