Over time, If you solo mine 100 blocks, 1 block will be missed due to the dev fee on average. If your on the pool your hashrate will be shown 1% less on average.
Yes, and if one has higher hashrate for the remaining 99%, then on the long run one will have more blocks found, say, not 100 but 105. Minus 1.05 lost blocks due to DevFee (1%), and still 103.95 blocks found on average.